Both sound and light can travel in
A) a vacuum.
B) water.
C) both of these
D) none of the above
Answer: B
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Why do comet's tails always point away from the Sun?
A) because of solar wind B) because the inner planets cause the ice and other volatile materials to be pulled towards their orbits C) because of the comet's interaction with dark matter D) because when they move away from the Sun they begin to lose inertia
Without greenhouse gases in our atmosphere, the Earth's oceans would not be liquid
Indicate whether the statement is true or false
In photoelectric emission, the work function is the minimum
A) frequency of light to produce emission. B) energy required to eject an electron from the surface. C) energy an emitted electron possesses. D) none of the above
A glass plate with an index of refraction is 1.57 is immersed in an oil having a refractive index of 1.40. The surface of the glass is inclined at an angle of 54° with the vertical. A horizontal light ray in the glass strikes the interface
What is the angle that the refracted ray, in the oil, makes with the horizontal? A) 11° B) 5.6° C) 8.3° D) 14° E) 17°