Light strikes a diamond (n = 2.42) immersed in glycerin (n = 1.473) at an angle of 60° relative to the normal to the surface. What is the angle of refraction?
A. 20°
B. 60°
C. 32°
D. 64°
E. 15°
Answer: C
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Tides are influenced by
a. the Moon. b. the Sun. c. the uneven surface of the Earth. d. all of the above. e. none of the above.
A particle with non-zero kinetic energy will
A. always have the same wavelength as the same energy photon. B. always have a greater wavelength than the same energy photon. C. always have a shorter wavelength than the same energy photon. D. sometimes have a greater wavelength than the same energy photon. E. sometimes have a shorter wavelength than the same energy photon.
The sound of a bird singing is given as 5 dB. What is the intensity of the sound of a bird singing?
a. 
b. 
c. 
d. 
e. 
Most polymers that are solid at room temperature do not mix with other polymers even when melted, because of the very high ___________of mixing.
Fill in the blank(s) with the appropriate word(s).