Explorations: Introduction to Astronomy (Arny), 6th Edition

Chapter 4: Light and Atoms

Online Quiz

1
What is light?
A)Light is radiant energy in the form of a stream of energy particles, called photons.
B)Light is radiant energy in the form of a wave of electromagnetic energy.
C)Both a and b.
D)Neither a nor b.
2
Assuming that light could curve around the Earth, about how long would it take for one trip?
A)1/7th second.
B)1 second.
C)7 seconds.
D)7 minutes.
3
What is the approximate wavelength of red light?
A)5 m.
B)7 cm
C)400 nm.
D)700 nm
4
List these electromagnetic radiations from short to long wavelengths.
A)Gamma rays, X-rays, Ultraviolet, Visible light, Infrared, Radio waves
B)Radio waves, Infrared, Visible light, Ultraviolet, X-rays, Gamma rays
C)Gamma rays, X-rays, Infrared, Visible light, Ultraviolet, Radio waves
D)Radio waves, Ultraviolet, Visible light, Infrared, X-rays, Gamma rays
5
List these electromagnetic radiations from lowest to highest energy.
A)Gamma rays, X-rays, Ultraviolet, Visible light, Infrared, Radio waves
B)Radio waves, Infrared, Visible light, Ultraviolet, X-rays, Gamma rays
C)Gamma rays, X-rays, Infrared, Visible light, Ultraviolet, Radio waves
D)Radio waves, Ultraviolet, Visible light, Infrared, X-rays, Gamma rays
6
According to Wien's law, a hotter object will __ a cooler object.
A)appear darker than
B)radiate the same intensity of wavelengths as
C)radiate more strongly at shorter wavelengths than
D)appear the same color as
7
What is the difference between emission and absorption in an atom?
A)In emission, the nucleus goes from a lower to a higher orbit.
B)In emission, the electron goes from a higher to a lower orbit.
C)In absorption, the electron goes from a higher to a lower orbit.
D)Both b and c.
8
What is the relationship between wavelength (L) and frequency (f)? ("c" is the speed of light)
A)Lf = c
B)L/f = c
C)f/L = c
D)Lc = f
9
Which of these are effects of the Doppler shift?
A)When an object is moving toward us, the wavelengths of its light decrease.
B)When an object is moving away from us, the wavelengths of its light get longer.
C)When an object accelerates, the wavelengths of its light get warmer
D)Both a and b are correct.
10
Of these gases in the Earth's atmosphere, which strongly absorbs infrared radiation?
A)Water vapor.
B)Nitrogen.
C)ozone.
D)Both a and c
11
Which gas(es) in the Earth's atmosphere strongly absorb ultraviolet radiation?
A)Ozone and oxygen
B)Nitrogen and argon.
C)Water vapor and carbon dioxide
D)None of the above.
12
What type of spectrum is emitted by a heated solid object (such as the filament of an incandescent bulb)?
A)Continuous.
B)Emission line.
C)Absorption line.
D)None of the above.
13
What type of spectrum is observed when the light from a hot, dense body is seen through a cooler, tenuous gas?
A)Continuous.
B)Emission line.
C)Absorption line.
D)None of the above.
14
What type of spectrum is emitted by a hot, tenuous gas?
A)Continuous.
B)Emission line.
C)Absorption line.
D)None of the above.
15
What are some of the things astronomers can learn about astronomical objects from their spectra?
A)Chemical composition.
B)Whether a gas or solid or combination, due to the type of spectrum.
C)How fast the objects are moving.
D)All of the above
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