Physics ch. 14

Flashcard maker : Lily Taylor
Which travels faster through a vacuum – an infrared ray or a gamma ray?
a. infrared
b. gamma
c. same speed, c
Electromagnetic waves are composed of…..
a. perpendicular longitudinal waves
b. vibrating light vectors
c. electric and magnetic fields
d. light waves
The smallest portion fo the electromagnetic spectrum is…
a. radio
b. none in particular, as all make up equal portions of the spectrum
c. visible light
d. infrared
The electromagnetic waves having the highest speed in free space are….
a. none in particular, as gamma, radio, and light have the same speed
b. radio waves
c. gamma rays
d. light waves
The electromagnetic radiation mostly absorbed in ordinary glas is….
a. red light
b. ultraviolet
c. yellow-green light
d.translucent light
Strictly speaking, the light that meets and passes through a pane of window glass…
a. is the same light that emerges
b. gains energy
c. is not the same light that emerges
d. is largely converted to heat in the glass
At the same time an astronaut on the moon sees a solar eclipse, observers on earth see
a. no eclipse at all
b. a solar eclipse
c. a lunar eclipse
Things seen by moonlight usually aren’t colored because moonlight
a. doesn’t have very many colors in it
b. photons don’t have enough energy to activate the retina’s cones
c. is too dim to activate the retina’s cones
d. all of these
e. none of these
What is the wavelength of an electromagnetic wave that has a frequency of 1 Hz?
a. 1 m
b. more than 1 m
c. less than 1 m
The main difference between a radio wave and a sound wave is their different
a. wavelengths
b. modes of travel
c. amplitudes
d. energies
e. frequencies
If a light signal and a radio signal were emitted simultaneously from Alpha Centauri, the first to reach Earth would be the
a. light signal
b. radio signal
c. both would reach Earth at the same time
Which of the following cannot travel in a vacuum
a. a radio wave
b. a light wave
c. a sound wave
d. all can travel in a vacuum
e. none can travel in a vacuum
Red-hot and blue-hot stars appear white to the eye because
a. the eye has difficulty seeing color at night
b. eye receptivity peaks in the yellow-green part of the spectrum
c. they are too dim to fire the rods
d. they are overwhelmed by the blackness of the nighttime sky
e. they are too dim to fire the cones
The Earth’s atmosphere is transparent to most waves in the
a. infrared part of the spectrum
b. entier Electromagnetic Spectrum
c. ultraviolet part of the spectrum
d. visible part of the spectrum
Sunburns are produced by
a. infrared light
b. visible light
c. ultraviolet light
d. all of these
e. none of these
Consider light energy that is momentarily absorbed in glass and then re-emitted. Compared to the absorbed light, the frequency of the re-emitted light is
a. the same
b. slightly more
c. considerably more
d. considerably less
e. slightly less
Which of the following is fundamentally different from the others
a. gamma rays
b. radio waves
c. light waves
d. sound waves
e. x-rays
The natural frequency of the atoms in glass is the
a. visible part of the spectrum
b. ultraviolet part of the spectrum
c. infrared part of the spectrum
The main difference between a radio wave and a light wave is its
a. speed
b. frequency
c. wavelength
d. all of these
e. two of these
Compared to radio waves, the velocity of visible light waves in a vacuum is
a. more
b. less
c. the same
The source of all electromagnetic waves is
a. crystalline fluctuations
b. vibrating atoms
c. changes in atomic energy levels
d. accelerating electric charges
e. none of these
Short wavelengths of visible light interact more frequently with the atoms in glass than do longer wavelengths. Does this interaction time tend to speed up or slow down the average speed of short-wavelentgh light in glass?
a. speed up
b. slow down
A helium-neon laser emits light of wavelength 633 nm. Light from an aragon laser has a wavelength of 515 nm. Which laser emits the higher frequency light?
a. helium-neon laser
b. argon laser

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