Light

13) Which of the following is fundamentally different from the others? A) sound waves B) X-rays C) gamma rays D) light waves E) radio waves

A

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.

A

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.

A

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

A

22) Sunburns are produced by A) ultraviolet light. B) visible light. C) infrared light. D) all of these E) none of these

A

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

A

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. B) reading glasses. C) both D) neither

A

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.

B

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.

B

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.

B

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.

B

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.

B

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

B

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

B

8) Compared to ultraviolet waves, the wavelength of infrared waves is A) shorter. B) longer. C) the same.

B

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B

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.

C

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.

C

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

C

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

C

5) Electromagnetic waves can travel A) through a vacuum. B) through a medium. C) through either a medium or a vacuum.

C

7) Which of these electromagnetic waves has the shortest wavelength? A) radio waves B) infrared waves C) X-rays D) ultraviolet waves E) light waves

C

9) Compared to radio waves, the velocity of visible light waves in a vacuum is A) less. B) more. C) the same.

C

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C

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

D

12) The source of all electromagnetic waves is A) heat. B) magnetic fields. C) electric fields. D) vibrating charges. E) none of these

D

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.

E

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

E