Quiz 3 Question 1 1 . As the wavelength of a light wave gets shorter: a. its amp

Question

Quiz 3

Question 1 1.

As the wavelength of a light wave gets shorter:

a. its amplitude gets larger.

b. its frequency does not change.

c. its frequency gets lower.

d. its frequency gets higher.

e. its amplitude gets smaller. 5 points

Question 2 1.

An atom will be excited from its ground state to a higher energy state if:

a. it emits a photon with the fixed energy corresponding to the energy difference between states.

b. it absorbs a photon with the fixed energy corresponding to the energy difference between states.

c. it absorbs a photon with any energy.

d. it gets decayed.

e. None of the above. 5 points

Question 3 1.

What type of waves exhibit the Doppler effect?

a. Sound waves.

b. Gamma-rays.

c. X-rays.

d. Water waves.

e. All of the above. 5 points

Question 4 1.

As a star becomes twice hotter, its emitting power:

a. becomes twice greater.

b. becomes 16 times less.

c. becomes 8 times greater.

d. becomes 16 times greater.

e. does not change. 5 points

Question 5 1.

Radio telescopes need to have larger apertures to:

a. increase their light gathering power to collect weak radio signals.

b. increase image magnification.

c. increase their resolving power to observe fine structures of radio sources.

d. decrease image magnification.

e. both A and C. 5 points

Question 6 1.

As a star moves toward an observer, the wavelength of the observed absorption lines:

a. becomes longer (or red-shifted).

b. becomes shorter (or blue-shifted).

c. does not change.

d. All of the above.

e. None of the above. 5 points

Question 7 1.

As a body gets hotter, it emits most of its power:

a. at shorter wavelength.

b. at longer wavelength.

c. radio band.

d. at higher frequency.

e. Both A and D.

f. None of the above. 5 points

Question 8 1.

Adaptive optics can increase the angular resolution of an image by:

a. burning Earth’s atmospheric path by a laser.

b. observing in the x-ray band.

c. taking a telescope out of Earth’s atmosphere.

d. correcting for the effects of atmospheric turbulence in real time. 5 points

Question 9 1.

Refractors have disadvantages over reflectors because:

a. their primary objective (lens) suffers from chromatic aberration.

b. their primary objective (lens) is under their own weight.

c. of their greater manufacturing cost.

d. two sides of the refractor telescope's objective need to be perfect rather than one side in reflectors.

e. All of the above. 5 points

Question 10 1.

Refraction of light waves occurs:

a. when light spreads into a rainbow of colors.

b. when a wave changes direction of propagation as it passes from one medium to another at any angle other than 90° or 0°.

c. when it gets reflected from the surface.

d. None of the above. 5 points

Question 11 1.

A telescope's resolving power measures its ability to view:

a. fainter objects.

b. more distant objects.

c. finer structures.

d. higher frequency objects.

e. younger objects. 5 points

Question 12 1.

As light from a rarefied hot gas passes through a prism, it produces:

a. a continuous spectrum.

b. an emission line spectrum.

c. an absorption line spectrum.

d. All of the above.

e. None of the above. 5 points

Question 13 1.

As light from an opaque object (star) passes through a prism, it produces:

a. a continuous spectrum.

b. an emission line spectrum.

c. an absorption line spectrum.

d. All of the above.

e. None of the above.

Question 14 1.

As light from a star passes through a rarefied cold gas and then passes through a prism, it produces:

a. a continuous spectrum.

b. an emission line spectrum.

c. an absorption line spectrum.

d. All of the above.

e. None of the above. 5 points

Question 15 1.

Waves manifest themselves as:

a. longitudinal or transverse.

b. periodic disturbances propagating energy in space and time.

c. disturbances with a characteristic wavelength and frequency.

d. All of the above.

e. None of the above. 5 points

Question 16 1.

To construct an image gamma-ray telescopes use:

a. wave properties of light.

b. particle properties of light.

c. light refraction.

d. light dispersion.

e. All of the above. 5 points

Question 17 1.

Which of the spectral bands has the longest wavelengths?

a. X-ray.

b. Gamma-ray.

c. Visible.

d. IR band.

e. Radio. 5 points

Question 18 1.

Which of the following spectral bands are blocked by the Earth’s atmosphere:

a. gamma-ray.

b. x-ray.

c. most of the IR band.

d. long wavelength radio emission.

e. All of the above.

f. None of the above. 5 points

Question 19 1.

Absolute zero temperature corresponds to:

a. a minimum possible kinetic energy of thermal motions of atoms and molecules in a body.

b. the freezing point of water.

c. the freezing point of helium.

d. the boiling point of water.

e. None of the above. 5 points

Question 20 1.

The Keck's telescope mirror is about 4 times larger in diameter than the Hubble Space Telescope's (HST) mirror. How much greater is Keck's light-gathering power with respect to the HST's?

a. 3 times.

b. 6 times.

c. 8 times.

d. 16 times.

e. 27 times.

Explanation / Answer

Quiz 3

Question 1 1.

As the wavelength of a light wave gets shorter:

d. its frequency gets higher.

Velocity equals product of frequency and wavelength. and C is constant, which means frequency and wavelength are inversely proportional.

Question 2 1.

An atom will be excited from its ground state to a higher energy state if:

b. it absorbs a photon with the fixed energy corresponding to the energy difference between states.

Question 3 1.

What type of waves exhibit the Doppler effect?

e. All of the above.

Question 4 1.

As a star becomes twice hotter, its emitting power:

d. becomes 16 times greater.

Question 5 1.

Radio telescopes need to have larger apertures to:

e. both A and C.   

Question 6 1.

As a star moves toward an observer, the wavelength of the observed absorption lines:

b. becomes shorter (or blue-shifted).

Question 7 1.

As a body gets hotter, it emits most of its power:

e. Both A and D.

Question 8 1.

Adaptive optics can increase the angular resolution of an image by:

d. correcting for the effects of atmospheric turbulence in real time.

Question 9 1.

Refractors have disadvantages over reflectors because:

e. All of the above.   

Question 10 1.

Refraction of light waves occurs:

b. when a wave changes direction of propagation as it passes from one medium to another at any angle other than 90° or 0°.

Question 11 1.

A telescope's resolving power measures its ability to view:

c. finer structures.

Question 12 1.

As light from a rarefied hot gas passes through a prism, it produces:

c. an emission line spectrum

Question 13 1.

As light from an opaque object (star) passes through a prism, it produces:

a. a continuous spectrum.

Question 14 1.

As light from a star passes through a rarefied cold gas and then passes through a prism, it produces:

c. an absorption line spectrum.

Question 15 1.

Waves manifest themselves as:

d. All of the above.

Question 16 1.

To construct an image gamma-ray telescopes use:

b. particle properties of light.

Question 17 1.

Which of the spectral bands has the longest wavelengths?

e. Radio.

Question 18 1.

Which of the following spectral bands are blocked by the Earth’s atmosphere:

e. All of the above.

Question 19 1.

Absolute zero temperature corresponds to:

a. a minimum possible kinetic energy of thermal motions of atoms and molecules in a body.

Question 20 1.

The Keck's telescope mirror is about 4 times larger in diameter than the Hubble Space Telescope's (HST) mirror. How much greater is Keck's light-gathering power with respect to the HST's?

d. 16 times.

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