A light ray is incident on the surface of water (n = 1.33) at an angle of 60° relative to the normal to the surface. The angle of the reflected wave is
a. 80°
b. 40°
c. 20°
d. 60°
e. 30°
d
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If grand unified theories are correct, what caused inflation at the end of the GUT era?
A) Gravity was an extremely weak force at this period in time. B) Large amounts of matter and antimatter annihilated at this time. C) There wasn't enough matter present to slow down the expansion at that time. D) The universe was too small and needed to grow quickly. E) An enormous amount of energy was released when the strong force froze out (became distinct) from the GUT force.
A transistor is an example of a
A) resistor. B) superconductor. C) semiconductor. D) dry cell. E) transmitter.
____ galaxies have a great many short spiral segments branching from the spiral arms
a. Grand design b. Super spiral c. Cepheid d. RR Lyra e. Flocculent
Define the velocity, wavelength, and frequency of a wave and give an example of each. Use symbol notation in the definitions