The __________ occurs when electrons are emitted when light strikes the surface of a metal
Fill in the blank(s) with correct word
photoelectric effect
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What observational evidence suggests that the centers of quasars are small, about a fraction of a light-year?
A. photographs of quasars B. the fact that quasars are so distant, and therefore are very young C. They emit radiation over a very wide range of wavelengths D. The intensity of their radiation fluctuates over periods of months E. All of these choices are correct.
What is the magnitude of the free-fall acceleration at a point that is a distance 2R above the surface of the Earth, where R is the radius of the Earth?
a. 4.8 m/s2 b. 1.1 m/s2 c. 3.3 m/s2 d. 2.5 m/s2 e. 6.5 m/s2
If the headlights on a car are separated by 1.3 m, how far down the road can they be resolved if the angular resolution of the eye is about 5 × 10-4 rad?
A) 1.3 km B) 5.0 km C) 4.8 km D) 0.65 km E) 2.6 km
According to most scientists, when did the first hominids--direct human forbears that were fully separated from the apes--appear on Earth?
A) a few billion years ago B) a few thousand years ago C) about a billion years ago D) a few million years ago E) about 100 billion years ago