# Conceptual Physics Hewitt Weston

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```					Conceptual Physics Hewitt Ch 27

1) Most of the waves in the electromagnetic spectrum are
A) red light.
B) blue light.
C) green light.
D) invisible.
Diff: 1
Topic: Properties of Light

2) Electromagnetic waves consist of
A) compressions and rarefactions of electromagnetic pulses.
B) oscillating electric and magnetic fields.
C) particles of light energy.
D) high-frequency gravitational waves.
Diff: 1
Topic: Properties of Light

4) A source of electromagnetic waves is
A) Stationary charged particles .
B) vibrating atoms.
C) accelerating electric charges.
D) crystalline fluctuations.
E) none of these
Diff: 1
Topic: Properties of Light

5) Electromagnetic waves can travel
A) through a vacuum.
B) through a medium.
C) through either a medium or a vacuum.
Diff: 1
Topic: Properties of Light

6)     The main difference between a radio wave and a light wave is its
A) speed.
B) wavelength.
C) frequency.
D) all of these
E) two of these
Diff: 1
Topic: Properties of Light
7) Which of these electromagnetic waves has the shortest wavelength?
B) infrared waves
C) X-rays
D) ultraviolet waves
E) light waves
Diff: 1
Topic: Properties of Light

8) Compared to ultraviolet waves, the wavelength of infrared waves is
A) shorter.
B) longer.
C) the same.
Diff: 1
Topic: Properties of Light

9) Compared to radio waves, the velocity of visible light waves in a vacuum is
A) less.
B) more.
C) the same.
Diff: 1
Topic: Properties of Light

11) If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a
A) period of 1000 s.
B) speed of 1000 m/s.
C) wavelength of 1000 m.
D) frequency of 1000 Hz.
E) wavelength of 1000 km.
Diff: 1
Topic: Properties of Light

12) The source of all electromagnetic waves is
A) heat.
B) magnetic fields.
C) electric fields.
D) vibrating charges.
E) none of these
Diff: 1
Topic: Properties of Light

13) Which of the following is fundamentally different from the others?
A) sound waves
B) X-rays
C) gamma rays
D) light waves
Diff: 1
Topic: Properties of Light

14) The natural frequency of the atoms in glass is in the
A) infrared part of the spectrum.
B) visible part of the spectrum.
C) ultraviolet part of the spectrum.
Diff: 1
Topic: Properties of Light

15) When ultraviolet light is incident upon glass, atoms in the glass
A) are forced into vibration.
B) resonate.
C) pass the light energy along practically undiminished.
D) freely absorb and re-emit most of the ultraviolet light.
Diff: 1
Topic: Properties of Light

16) When visible light is incident upon clear glass, atoms in the glass
A) are forced into vibration.
B) resonate.
C) convert the light energy into internal energy.
Diff: 1
Topic: Properties of Light

17) 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) considerably less.
B) slightly less.
C) the same.
D) slightly more.
E) considerably more.
Diff: 1
Topic: Properties of Light

18) The speed of light in the void between molecules in glass is
A) more than its speed in a vacuum.
B) the same as its speed in a vacuum.
C) less than its speed in a vacuum.

19) Compared to its average speed in air, the average speed of a beam of light in glass is
A) more.
B) less.
C) the same.
Diff: 1
Topic: Properties of Light
20) Infrared waves are often called heat waves because they
A) emanate from relatively hot sources.
B) consist of frequencies lower than those of visible light.
C) induce resonance in molecules and increase internal energy in a substance.
D) are absorbed rather than reflected by the skin.
E) are the predominant waves emitted by the sun.
Diff: 1
Topic: Properties of Light

21) Materials generally become warmer when light is
A) absorbed by them.
B) reflected by them.
C) transmitted by them.
D) all of these
E) none of these
Diff: 1
Topic: Properties of Light

22) Sunburns are produced by
A) ultraviolet light.
B) visible light.
C) infrared light.
D) all of these
E) none of these
Diff: 1
Topic: Properties of Light

23) The Earth's atmosphere is transparent to most waves in the
A) infrared part of the spectrum.
B) visible part of the spectrum.
C) ultraviolet part of the spectrum.
D) entire electromagnetic spectrum.

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25) A solar eclipse occurs when the
A) sun passes into Earth's shadow.
B) moon passes into the Earth's shadow.
C) the moon's shadow touches Earth.
Diff: 1
Topic: Properties of Light

26) A partial solar eclipse occurs for people in the sun's
A) umbra.
B) penumbra.
C) none of these
Diff: 1
Topic: Properties of Light

27) While Earth is experiencing a total solar eclipse an observer on the side of the moon facing the earth would
see
A) Earth disappear from the sky.
B) Earth dim and turn reddish.
C) nothing unusual.
D) a tiny dark spot move across the face of Earth.
Diff: 1
Topic: Properties of Light

35) If a light signal and a radio signal were emitted simultaneously from Alpha Centauri, the first to reach Earth
would be the
B) light signal.
C) both would reach Earth at the same time.
Diff: 2
Topic: Properties of Light

36) Which of the following cannot travel in a vacuum?
A) a light wave
B) a sound wave
D) All can travel in a vacuum.
E) None can travel in a vacuum.
Diff: 2

37) The main difference between a radio wave and a sound wave is their different
A) frequencies.
B) wavelengths.
C) energies.
D) amplitudes.
E) modes of travel.
Diff: 2
Topic: Properties of Light

38)       If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes
A) for the sun to disappear.
B) to operate receiving equipment in the dark.
C) for light to travel from the sun to the Earth.
D) all of these
E) none of these
Diff: 2
Topic: Properties of Light

39) Glass is transparent to wave frequencies that
A) match its natural frequencies.
B) are below its natural frequencies.
C) both of these
D) none of these
Diff: 2
Topic: Properties of Light

40) Glass is opaque to wave frequencies that
A) match its natural frequencies.
B) are below its natural frequencies.
C) both of these
D) none of these
Diff: 2
Topic: Properties of Light

41) A pair of sunglasses and a pair of clear reading glasses are left in the sunlight. The hotter glasses would be
the
A) sunglasses.
C) both
D) neither
Diff: 2
Topic: Properties of Light

42) The moon would be at its fullest just before the time of a
A) solar eclipse.
B) lunar eclipse.
C) both of these
D) none of these

43) What is the wavelength of an electromagnetic wave that has a frequency of 1 hertz?
A) less than 1 m
B) 1 m
C) more than 1 m
Diff: 2
Topic: Properties of Light

44) What is the wavelength of an electromagnetic wave that has a frequency of 3 kilohertz?
A) less than 1 km
B) 1 km
C) more than 1 km
Diff: 2
Topic: Properties of Light

45) What is the frequency of an electromagnetic wave that has a wavelength of 300,000 km?
A) less than 1 Hz
B) 1 Hz
C) more than 1 Hz
Diff: 2
Topic: Properties of Light

48) At the same time an astronaut on the moon sees a solar eclipse, observers on Earth see
A) a lunar eclipse.
B) a solar eclipse.
C) no eclipse at all.

49. Polarization is a property of
A) transverse waves.
B) longitudinal waves.
C) both
D) neither
Diff: 1
Topic: Light Waves

50) The vibrational direction of the electron and the plane of polarization of the light it emits
A) are the same.
B) are at right angles to each other.
C) may or may not be at right angles to each other.
D) are independent of each other.
Diff: 1
Topic: Light Waves

51)   Some double-pane airplane windows darken when the inner pane is rotated. The panes are
A) thin films.
B) Polaroid filters.
C) optical fibers.
Diff: 1

52) Light will not pass through a pair of Polaroids when their axes are
A) parallel.
B) perpendicular.
C) 45 degrees to each other.
D) two of these
E) all of these
Diff: 1
Topic: Light Waves

53) The glare seen from water is largely
A) horizontally polarized.
B) vertically polarized.
C) non polarized.
Diff: 1
Topic: Light Waves

54) The polarization axes of ordinary sunglasses are
A) vertical.
B) horizontal.
C) at right angles to each other.
Diff: 1
Topic: Light Waves

55) The polarization axes of glasses for 3-D viewing are
A) vertical.
B) horizontal.
C) at right angles to each other.