Glendale Community College » Astronomy » Astronomy 120 - Stars and Galaxies » Fall 2022

Astronomy 120 - Stars and Galaxies » Fall 2022 » Unit 4 Quiz

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Question #1

When the light from a bright star is observed after having passed through a cool cloud of dust in front of it, what sort of spectrum can we expect to see in our observations?

A. continuous spectrum

B. emission spectrum

C. absorption spectrum

Question #2

Astronomers can determine the elemental components of a star by observing the star's spectrum.

A. continuous

B. emission

C. absorption

Question #3

An absorption spectrum...

A. shows a full range of all the colors of the rainbow but contains gaps at specific wavelengths.

B. shows light of ultraviolet wavelengths or shorter.

C. shows a full range of all the colors of the rainbow.

D. shows only light of specific wavelengths.

Question #4

What is the wavelength of a photon with 1.8 x 10–15 J of energy? The following equation(s) and constant(s) will be useful: E= hc/λ where E = energy (in eV or J) λ = wavelength (in m or nm) h = 6.62 x 10–34 J ⋅ s c = 3.00 x 108 m/s hc = 1240 eV ⋅ nm 1 eV = 1.6 x 10–19 J.

A. 1100 nm

B. 11 nm

C. 0.11 nm

D. 1.1 nm

Question #5

A star of temperature 35,000 K would peak at what wavelength? The following equation(s) and constant(s) will be useful: T = b/λmax where T = temperature (in K) λmax = peak wavelength (in nm) b = Wien's constant = 2897772 nm K

A. 390 nm

B. 590 nm

C. 850 nm

D. 83 nm

Question #6

Which of these wavelengths is the reddest?

A. 520 nm

B. 480 nm

C. 390 nm

D. 650 nm

Question #7

A "spectrum" is a commonly-used word for a graph depicting intensity vs .

A. wavelength

B. color

C. mass

D. temperature

Question #8

Why are there no stars that appear green?

A. Because there would also be a lot of red and blue light, making that star appear white.

B. Because our eyes cannot detect wavelengths of pure green light.

C. Because there are no stars that have peak wavelengths in the green portion of the electromagnetic spectrum.

D. Because those wavelengths are blocked by the Earth's atmosphere.

Question #9

Which star is the hottest?

A. A star that appears white

B. A star that appears orange

C. A star that appears bluish-white

D. A star that appears yellow

Question #10

By definition, what is a perfect blackbody?

A. An object that emits less electromagnetic radiation than it absorbs.

B. An object that completely absorbs and emits all possible ranges of electromagnetic radiation.

C. An object that completely reflects and emits all possible ranges of electromagnetic radiation.

D. An object that absorbs over 90% of the electromagnetic radiation it emits.

Question #11

When electrons jump from lower to higher energy levels within the atom, they must light to do so.

A. reflect

B. direct

C. absorb

D. emit

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