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91 True/False questions

The main reason skilled observatories are constructed on the greatest mountaintops is come → collect a large amount of light and bring it right into focus.

You are watching: All modern large optical telescopes are refractors.

True False reduce atmospheric blurring" type="hidden">

Both the Keck and VLT observatories space designed to permit interferometry to be used. T/F → True.Although the technique of interferometry was pioneered making use of radio telescopes, it is currently being extended to the infrared, and perhaps eventually optical regions. See ar 5.6 in your textbook.

True False

As telescopes become larger and also larger, astronomers donate → True

True False mirroring telescopes, in component because big lenses and mirrors death under their own weight, and it is easier to assistance a mirror along its entire ago side 보다 it is to support a lens only around its edge" type="hidden">

Astronomers usage the hatchet "seeing" to explain which that the following? → The effects of atmospheric turbulence

True False

What is intended by the "diffraction limited resolution" that a telescope? → The best possible angular resolution that can be obtained by a telescope that a provided size if all various other sources of blurring room eliminated

True False

The mirrors because that X-ray telescopes are the same shape together those of optical reflectors. → False

True False

The Arecibo radio telescope is set out prefer which optical telescope design? → prime focus reflector

True False

Radio astronomy have the right to only be done from up in space, as result of our ionosphere. → True.Section 5.5 that the text and also the online photo archive because that Chapter 5 contain many pictures showing such arrangements.

True False False" type="hidden">

The best way to research young stars covert behind interstellar dust clouds would be to usage → infrared light

True False

One system for improving telescopic images entails collecting data from a component of the skies where there space no well-known sources that radiation. T/F → planet is a heat source and the telescope have to be kept an extremely cool.

True False True. The data gathered would consist of background noise. This data deserve to be offered in computer system processing of photos taken v the telescope to enhance the quality of the image." type="hidden">

Optical telescopes room usually offered only at night, yet radio telescopes can be offered day or night. → fix finer detail

True False True" type="hidden">

Many observatories are inserted on height of mountains so they will certainly be closer to the objects they room observing. T/F → True.Yes. Although the sunlight is a radio source, that does not interfere unduly through daytime use of radio telescopes.

True False False.An observatory on a tall mountain is over much of the atmosphere. Atmospheric results are a main reason why Earth-based telescopes cannot achieve their diffraction-limited resolution." type="hidden">

The Hubble room Telescope provides us its ideal resolution with X-rays. → False

True False

The primary purpose of any kind of telescope is to create an enormously enhanced image that the field of view. → False.Magnification is secondary. Nearly all stars appear as only points of light through also the most an effective telescopes. Light-gathering power and also resolving power space the most vital properties of astronomical telescopes.

True False False" type="hidden">

The primary purpose of a telescope is come → collection a big amount the light and bring it right into focus.

True False

An object having a temperature that 300 would certainly be finest observed with an infrared telescope. → True

True False

Because gamma light ray have an extremely short wavelengths, gamma-ray telescopes can achieve extremely high angular resolution. → False

True False

As a rule, larger telescopes have the right to detect fainter objects. → False

True False True" type="hidden">

What is supposed by the "prime focus" of a telescope? → The best feasible angular resolution that can be obtained by a telescope the a given size if all other sources that blurring are eliminated

True False The point at which the incoming irradiate is focused to produce an image, where analysis instruments and imaging cameras deserve to be placed" type="hidden">

The _______ ________ of the Hubble space Telescope is far better for much shorter (bluer) wavelength of light than for much longer (redder) wavelength of light → Angular resolution

True False

What is true the radio telescopes? → its ability to differentiate two adjacent objects close together in the sky

True False They have actually poorer angular resolution than a refractor." type="hidden">

When multiple radio telescopes are supplied for interferometry, resolving power is most boosted by raising → the distance between telescopes

True False

The Hubble an are Telescope is the largest optical telescope ever built. T/F → False

True False False.The HST owes its image quality (after correction for an error in the primary mirror) to the lack of atmospheric blurring." type="hidden">

Radio observations might be make in the daytime as well as at night. T/F → False

True False True.Yes. Although the sunlight is a radio source, the does not interfere unduly with daytime usage of radio telescopes." type="hidden">

Radio telescopes are large in part to boost their angular resolution, which is poor because the the lengthy wavelengths in ~ which castle are used to watch the skies. → False.Gamma-ray telescopes work-related by taking in high-energy photons, no by mirroring or refracting them.

True False True" type="hidden">

The huge research observatories top top Mauna Kea use gigantic ________ __________. → grazing incidence

True False showing telescopes" type="hidden">

Cassegrain-style telescopes are characterized by a feet in the objective mirror. T/F → True.The result folded optical path is offered in countless commercial amateur and professional telescope designs.

True False

The term see is supplied to explain how faint things can it is in detected by a telescope. → False

True False

Large arrays of widely separated radio telescopes can achieve very good resolution. What is the major reason the such great resolutions can not be completed by separation, personal, instance radio telescopes operating independently → deal with finer detail

True False Radio dishes bigger than a couple of tens that meters across are daunting to build, limiting their individual resolutions to numerous times worse 보다 the largest optical mirrors." type="hidden">

CCD detectors gather irradiate 10-20 times faster than the many sensitive photographic film. → fix finer detail

True False True" type="hidden">

A telescope design that provides a lens and no mirrors is a refractor. → reflecting telescopes, in part because large lenses and mirrors sag under their own weight, and also it is easier to support a mirror along its entire earlier side 보다 it is to assistance a lens only around its edge

True False True" type="hidden">

The main purpose that a telescope is to administer a magnified image of the stars. T/F → False.Magnification is secondary. Virtually all stars show up as just points of light through also the most an effective telescopes. Light-gathering power and also resolving power are the most crucial properties of expensive telescopes.

True False

The main benefit to using the HST is the enhanced amount of "night time" viewing it affords. → planet is a heat resource and the telescope should be kept really cool.

True False False" type="hidden">

The Chandra X-Ray observatory concentrates X rays v _________ _________ mirrors. → showing telescopes

True False grazing incidence" type="hidden">

Radio waves have the right to penetrate dusty areas of interstellar space because they are relatively unaffected by this intervening matter. T/F → True. Numerous parts that interstellar space (including the center of ours Galaxy) cannot be checked out at optical wavelengths, yet are conveniently detectable in the radio region.

True False

The amount of diffraction and also thus the resolution the the scope depends upon → its capacity to distinguish two nearby objects close with each other in the sky

True False the wavelength used and also the size of the key telescope target lens or mirror." type="hidden">

What is a CCD? → An digital imaging detector

True False

What is meant in astronomy through the phrase "active optics"? → Rapid modifications are made to the tilt and also location that the elements of a telescope to correct because that the effects of atmospheric and also instrumental distortion.

True False

CCD cameras and also photographic movie have roughly the same effectiveness for collecting light. T/F → False.Although CCD cameras have replaced photogenic movie in most applications, film is still supplied or some specialized applications.

True False

Radio telescopes often position their detectors at prime focus. T/F → True.Section 5.5 the the text and also the online picture archive because that Chapter 5 contain numerous pictures showing such arrangements.

True False

One difficulty in building large radio telescopes is gaining the large surfaces smooth sufficient to act together mirrors. T/F → False.Since radio waves have fairly long wavelengths, centimeters come meters, the reflector surfaces execute not need to be extremely smooth.

True False

A telescope with a 2-m diameter major mirror would certainly be an ext affected by diffraction than one through a 1-m-diameter mirror. T/F → ordinary stars

True False False.The diffraction border on resolution would actually be better (smaller) because that the larger telescope." type="hidden">

Compared to optical telescopes, radio telescopes space built huge because → radio photons don"t lug much energy.

True False

All wavelength of light take trip at the exact same speed in a vacuum, and carry the same energy per photon. → false

True False

If telescope mirrors can be do of weird sizes, the one through the most light-gathering power would certainly be → True.Yes. Back the sun is a radio source, the does not interfere unduly through daytime usage of radio telescopes.

True False rectangle v two 1- sides and also two 2- sides." type="hidden">

What difficulty does adaptive optics correct? → turbulence in the earth"s environment which create twinkling

True False

Infrared astronomy have the right to only be excellent from space. → False

True False

Compared with radio telescopes, optical telescopes can → They have poorer angular resolution 보다 a refractor.

True False solve finer detail" type="hidden">

The pair 10-m Keck telescopes have the right to work with each other to obtain far better angular resolution v a technique known as __________. → interferometry

True False

Chromatic aberration affect reflector telescopes. → They have poorer angular resolution 보다 a refractor.

True False False" type="hidden">

Like radio and also optical astronomy, infrared astronomy is easily done with ground-based telescopes. → False

True False

The quantity of light accumulated by a telescope is proportional come its area. T/F → the wavelength used and the size of the key telescope target lens or mirror.

True False True.This is the factor that astronomers need bigger telescopes to examine fainter objects." type="hidden">

Radio telescopes using really long baseline interferometry have created images v resolutions comparable to those that images created with optical telescopes. T/F → True.Section 5.5 of the text and the online picture archive for Chapter 5 contain numerous pictures reflecting such arrangements.

True False True. As far as fixing power is concerned, the reliable diameter of one interferometer is the distance in between its outermost dishes." type="hidden">

The Earth"s setting is the major factor limiting the use of ground-based radio telescopes. → False

True False

Galileo"s telescope designs using lenses were instances of _________ ________. → True

True False refracting telescopes" type="hidden">

All modern large optical telescopes space refractors. → False

True False

The opacity the the environment is partially corrected via adaptive optics. → false

True False

Which type of telescope go Galileo revolve skyward in 1610? → solitary lens refractor

True False

What is image processing? → computer system processing of electronic images to correct for defects and remove noise

True False

Which of the following statements around the use of infrared telescopes is true? → its capacity to differentiate two adjacent objects close together in the sky

True False The detector and also telescope have to be cooled to very low temperatures." type="hidden">

The Keck telescopes save on computer the largest single mirrors ever before constructed. → False.The HST fan its photo quality (after correction because that an error in the main mirror) come the absence of atmospheric blurring.

True False False" type="hidden">

The most important advantage of CCDs end film is the → The most

True False they record much an ext light in a given exposure time." type="hidden">

Ultraviolet and also X-ray telescopes deserve to be used only over Earth"s atmosphere. T/F → True.The atmosphere is opaque come electromagnetic radiation higher in frequency (i.e., much shorter in wavelength) than the close to ultraviolet, for this reason UV and also X-ray astronomy should be performed from space. Gamma rays, however, can be observed from the ground—not directly, however by observing the results of their interactions v the atmosphere.

True False

Photography through film is tho the preferred method of capturing fine information in the faintest, most far-off galaxies. → they document much more light in a offered exposure time.

True False False" type="hidden">

The Spitzer an are Telescope (SST) is stationed far from Earth due to the fact that → False

True False planet is a heat resource and the telescope must be kept very cool." type="hidden">

Gamma-ray telescopes rental the same simple design that optical instruments use. → False

True False

A significant advantage that a Newtonian reflector end a refractor is → True

True False the removed of chromatic aberration." type="hidden">

_____________ different the miscellaneous colors that light, enabling astronomers to recognize stellar composition and also may other stellar properties. → Spectrographs

True False

The greatest telescopes in usage today are reflectors, no refractors. T/F → True.The largest telescopes in all wavelength regions from radio to X-rays space all reflectors.

True False

Reflecting telescopes usually endure from chromatic aberration. T/F → False.Chromatic aberration is associated with refracting telescopes

True False

characteristics the telescopes → They have poorer angular resolution 보다 a refractor.

True False thing 3 sorting task" type="hidden">

How much an ext light would a 2-m-diameter telescope conference in a specific amount the time at a given wavelength compared with one that is 50 cm in diameter? → 16 times

True False

Stars carry out not twinkle; the instability the the atmosphere reasons this effect. → True

True False

An optical telescope of a offered size would have much better resolution in orange light than in blue light. T/F → Cassegrain

True False False.The diffraction border to resolution would be larger, producing worse resolution, in orange light 보다 in blue light because that a given telescope." type="hidden">

Radio telescopes would not represent a great choice for expensive study of which of the following species of object? → showing telescopes, in component because big lenses and also mirrors death under their own weight, and also it is easier to assistance a mirror along its entire back side than it is to support a lens only around its edge

True False simple stars" type="hidden">

What difficulty do refractor telescopes have actually that reflectors don"t? → chromatic aberration

True False

Radio telescopes have poorer angular resolution 보다 optical telescopes due to the fact that radio waves have a much much longer wavelength than optical waves. → True.Section 5.5 the the text and the online picture archive for Chapter 5 contain numerous pictures mirroring such arrangements.

True False True" type="hidden">

What kind of single telescope currently in operation has the greatest angular resolution? → Cassegrain

True False Optical" type="hidden">

The thickest lenses deflect and also bend light → The most

True False

What is the resolution that a telescope? → They have actually poorer angular resolution 보다 a refractor.

True False its capability to identify two nearby objects close with each other in the sky" type="hidden">

The image presented in figure 5.10 in the textbook ("Resolution") is sharpest as soon as the proportion of wavelength to telescope size is → Rapid changes are made to the tilt and also location the the facets of a telescope come correct because that the impacts of atmospheric and also instrumental distortion.

True False small" type="hidden">

What type of telescope emphasis is behind a main hole in the main mirror? → False

True False Cassegrain" type="hidden">

It is difficult to get rid of the atmospheric blurring skilled by ground-based optical telescopes. T/F → False

True False False.Active and/or adaptive optics deserve to be provided to compensate for much of the distortion the light because of atmospheric turbulence." type="hidden">

One that the primary advantages of CCDs end photographic plates is the former"s high performance in detecting light. → they record much much more light in a provided exposure time.

See more: Billie Jo Out Of The Dust Character Analysis Chart, Complete

True False True" type="hidden">

Galileo is attributed with developing the first reflector telescope. → False

True False

The key reason the most skilled research telescopes room reflectors is that → False

True False big mirrors are much easier to construct than huge lenses." type="hidden">

A 10-meter telescope has actually a bigger __________-_________ _____ than a 4-meter telescope. → light-collecting area

True False

Gamma-Ray telescopes are tough to make since they require large lenses or winter for focusing in bespeak to do images. T/F → False.Gamma-ray telescopes job-related by soaking up high-energy photons, no by showing or refracting them.

True False

One advantage of the Hubble an are telescope over ground based ones is the → False

True False in orbit, it have the right to operate close to its diffraction limit at clearly shows wavelengths." type="hidden">

Which that the complying with is an benefit the Hubble an are Telescope has over ground-based telescopes? → over there is no blurring due to the atmosphere

True False

What is the key reason the ultraviolet astronomy should be excellent in space? → its capability to distinguish two nearby objects close with each other in the sky

True False Earth's environment absorbs most ultraviolet wavelengths" type="hidden">