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LIght
Test Description: Physics of light
Instructions: Answer all questions to get your test result.
1) A light wave enters the Earth's atmosphere from a distant star. The wave carries
A
both energy and matter
B
matter, only
C
energy, only
D
neither energy or matter
2) What is the speed of light in lucite?
A
4.53 x 10^-9 m/s
B
2.43 x 10^2
C
2 x 10^8
D
1.24 x 10^8
3) The main factor determining the speed of an electromagnetic wave is
A
distance traveled through the medium
B
phase of the wave
C
nature of the medium
D
amplitude of the wave
4) A beam of light has a wavelength of 485 nanometers in air. What is the wavelength of this light in glycerol?
A
589 nm
B
150 nm
C
393 nm
D
330 nm
5) The angle of light reflection is always
A
180 degrees from the incident ray
B
bent when it enters the new medium
C
equal to the angle of reflection
D
equal to the angle of incidence
6) An electromagnetic wave is produced by charged particles vibrating at a rate of 4.8 x 10^21 vibrations per second. The EM wave is classified as
A
a radio wave
B
a gamma ray
C
visible light
D
an infared wave
7) Light strikes a mirror at an angle of 40 degrees with the mirror. What would be the angle of reflection?
A
40 degrees
B
30 degrees
C
90 degrees
D
50 degrees
8) An x-ray photon and a radio photon are traveling in a vacuum. Compared to the wavelength and energy of the x-ray photon the radio photon has a
A
longer wavelength and less energy
B
shorter wavelength and less energy
C
longer wavelength and more energy
D
shorter wavelength and more energy
9) How are electromagnetic and mechanical waves similar?
A
both carry energy
B
both can travel in a vacuum
C
both contain radio waves
D
both require a medium to travel
10) An incident ray travels through medium x at an angle of 56 degrees with the normal line. It then travels into air and is refracted at an angle of 45 degrees. What is the absolute index of refraction for medium X?
A
1.00
B
.85
C
1.67
D
1.47
*select an answer for all questions
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