When the surface of a metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following will also increase?
A) the number of electrons ejected per second
B) the maximum kinetic energy of the ejected electrons
C) the time lag between the onset of the absorption of light and the ejection of electrons
D) all of the above
E) two of the above
A
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In any natural process, some energy becomes unavailable to do useful work
Indicate whether the statement is true or false
An 8.0-kg object moving 4.0 m/s in the positive x direction has a one-dimensional collision with a 2.0-kg object moving 3.0 m/s in the opposite direction. The final velocity of the 8.0-kg object is 2.0 m/s in the positive x direction. What is the total kinetic energy of the two-mass system after the collision?
a. 32 J b. 52 J c. 41 J d. 25 J e. 29 J
When light enters a medium with a higher index of refraction it
A. is absorbed. B. is bent towards the normal. C. continues in the same direction. D. is bent away from the normal.
If the distance from the Sun to the Earth is represented by roughly 15 meters, then the distance from the Earth to the Moon on the same scale would be
a. about 30 meters. b. about 10 meters. c. about 1 meter. d. small than your hand.