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Astronomy > Test 2 Review > Flashcards

Test 2 Review Flashcards

1
Q

During a solar eclipse, the:
A. Sun comes between the Earth and the Moon
B. Moon comes between the Earth and the Sun
C. Sun goes below the horizon
D. Earth comes between the Sun and the Moon.

A

B

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2
Q

To witness an eclipse we must wait until which one of the following conditions is met?
A. Only the Earth must be on the line of node.
B. Only the Sun must be on the line of node.
C. Only the Moon must be on the line of node.
D. The Moon must be on the line of node and the other end of the line of node must point in the general direction of the Sun.

A

D

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3
Q

We can occasionally see a total eclipse of the Sun on Earth because:
A. The Moon is cooler than the Sun.
B. The sizes of Sun and Moon, when viewed from Earth, are almost the same.
C. The actual sizes of Sun and Moon are the same.
D. Both the Moon and Sun move precisely along the plane that contains the orbit of the Earth.

A

B

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4
Q 
How much of the total surface of the Moon is illuminated by the Sun when it is at first-quarter phase?
A. One quarter
B. Very little
C. All of it	
D. One half
A

D

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5
Q 
What is the phase of the Moon during an annular solar eclipse?
A. New
B. Gibbous
C. Full
D. First quarter
A

A

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6
Q 
Which type of telescope uses a lens as the main optical element? 
A. Radio telescope 
B. Cassegrain telescope 
C. Newtonian telescope 
D. Refracting telescope
A

D

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7
Q

The light-gathering power of a telescope is related directly to the:
A. Image quality of its optics (resolution).
B. Area of its primary mirror or lens.
C. Focal length of its primary mirror or lens.
D. Ratio of the focal lengths of its primary element (mirror or lens) and its eyepiece.

A

B

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8
Q

Chromatic aberration is the failure of a telescope objective to bring all colors of light to the same focus and appears at the prime focus:
A. In both reflecting and refracting telescopes.
B. Only in a refracting telescope.
C. Only in a reflecting telescope.
D. In all telescopes, since it is a basic property of light.

A

B

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9
Q

The largest refracting telescope in the world is the 102-cm (40 in.) diameter telescope at Yerkes Observatory, built in 1897. Refracting telescopes with larger diameter have never been built because they would:
A. sag too much under their own weight.
B. give too much magnification.
C. have too little chromatic aberration.
D. be too thick, and suffer too much spherical aberration.

A

A

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10
Q

At what distance from the objective lens in a refracting telescope is the image formed (i.e., where would the photographic film or electronic detector be placed)?
A. immediately behind the lens to collect the most light
B. its diameter
C. its focal length
D. Twice its focal length

A

C

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11
Q

Chromatic aberration is corrected by:
A. mounting a second lens made of different type of glass in addition to the first lens.
B. painting the surface of the lens jet black.
C. grinding the lens surfaces into a more curved shape.
D. mounting a prism in addition to the first lens.

A

A

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12
Q 
The magnifying power of a reflecting telescope, in terms of the focal length F of the primary mirror and the focal length f the eyepiece, (with F and f measured in the same units), is:
A. fF. 
B. f/F. 
C. F/f 2. 
D. F/f .
A

D

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13
Q

A spherical mirror suffers from spherical aberration because
A. the star light is distorted by the turbulence in the atmosphere.
B. the mirror sags under its own weight, distorting the image.
C. different parts of the mirror focus light a different distances from the mirror.
D. different colors are focused at different distances from the mirror.

A

C

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14
Q

Which of the following characteristics of an astronomical telescope is most important for determining the angular resolution?
A. the focal length of the eyepiece
B. the magnifying power of the telescope
C. the diameter of the objective lens or mirror
D. the focal length of the objective lens or mirror

A

C

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15
Q

It is difficult to improve the angular resolution of optical telescopes located on the surface of the Earth beyond a certain limit because
A. we would need to build larger telescopes and this is very expensive.
B. spherical mirrors suffer from too much aberration.
C. air turbulence distorts the star images.
D. large telescopes are always reflecting telescopes and these suffer from too much chromatic aberration.

A

C

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16
Q

Radio waves travel through space at what speed?
A. much faster than the speed of light
B. faster than the speed of light, since their wavelength is longer
C. slower than the speed of light
D. at the speed of light, 3 x 108 m/s

A

D

17
Q 
Light exists in a particle-like state as packets of energy called
A. electrons. 
B. neutrons. 
C. photons. 
D. protons.
A

C

18
Q

In a radio wave transmitter (such as that used by a radio or TV station), when the frequency of the signals is increased, the
A. wavelength is decreased.
B. speed of transmission of the waves is increased.
C. wavelength and speed of transmission both increase.
D. wavelength remains constant.

A

A

19
Q 
Choose the correct sequence of electromagnetic radiations, in order of increasing wavelengths. 
A. radio, IR, visible, UV 
B. UV, visible, radio, IR 
C. UV, visible, IR, radio 
D. visible, UV, IR, radio
A

C

20
Q 
Which of the following is not an electromagnetic wave? 
A. infrared wave
B. radio wave
C. sound wave 
D. Microwave
A

C

21
Q

A perfect blackbody is so named because it
A. reflects only the radiation falling on it and emits none of its own.
B. absorbs all radiation falling on it and reflects none.
C. never emits radiation.
D. always emits the same amount and color of radiation regardless of its temperature.

A

B

22
Q 
Wien's law, relating the peak wavelength λ max of light emitted by a dense object to its temperature T , can be represented by 
A. max = constant x T^4. 
B. max  = constant/T. 
C. max = constant/T2. 
D. max  = constant x T.
A

B

23
Q

When a rod of metal (without melting) is heated intensely, its predominant color
A. remains predominantly red as the intensity of light increases.
B. is white, all colors mixed together, as the intensity of light increases.
C. changes from red, through orange to white, and then to blue.
D. changes from blue through white, then orange and finally red, when it becomes red-hot at its hottest.

A

C

24
Q

The energy of a photon of X-rays, compared to the energy of a photon of visible light, is
A. about the same.
B. much lower.
C. variable and can be higher or lower under certain circumstances and in certain positions in the universe.
D. much higher.

A

D

25
Q

An astronomer studying a particular object in space finds that the object emits light only in specific, narrow emission lines. The correct conclusion is that this object
A. cannot consist of gases but must be a solid object.
B. is made up of a hot, dense gas surrounded by a rarefied gas.
C. is made up of a hot, dense gas.
D. is made up of a hot, low-density gas.

A

D

26
Q 
What gives the identity of an atom? 
A. The total number of neutrons. 
B. Its temperature. 
C. The number of protons. 
D. Its size.
A

C

27
Q

In its interaction with matter, light behaves
A. only as waves.
B. alternatively as particles or waves, switching its properties about once every second.
C. as both waves and particles, depending on the type of interaction.
D. only as particles.

A

C

28
Q

A cold, dark interstellar cloud of gas produces
A. a series of absorption lines at uniform wavelength spacings.
B. a uniform spectrum crossed by numerous dark absorption lines.
C. a unique series of emission lines.
D. a uniform spectrum containing all colors.

A

A

29
Q 
The \_\_\_\_\_\_\_\_\_\_\_\_\_ of a star’s atmosphere can be determined by identifying the pattern of lines in its spectrum.
A. mass 
B. distance 
C. size
D. chemical composition
A

D

30
Q 
The movement of a(n) \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ between allowed energy levels creates a spectral line.
A. Electron
B. ion 
C. neutron 
D. Proton
A

A

Astronomy (10 decks)

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