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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

Correct Answer

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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

Correct Answer

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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.

Correct Answer

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Most of the waves in the electromagnetic spectrum are


A) red light.
B) blue light.
C) green light.
D) invisible.

Correct Answer

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Sunburns are produced by


A) ultraviolet light.
B) visible light.
C) infrared light.
D) all of these
E) none of these

Correct Answer

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