Ultraviolet light is shone on a piece of metal that has a known work function, and electrons are observed being produced through the interaction of the light with the metal. The lamp that produces the light is now replaced with a lamp of the same intensity, but which produces photons having a longer wavelength. What difference is observed in the number of electrons produced per unit time?
A. The same number are produced.
B. More are produced.
C. Without knowing more about the wavelengths used, one cannot answer.
D. Fewer are produced.
C. Without knowing more about the wavelengths used, one cannot answer.
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Galaxy A receding from Galaxy B at a velocity of 75000 km/s, from the perspective of Galaxy B. Hubble's Law says that V=H0 x D. About how far is Galaxy A from Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
A. 50000 Mpc B. 100 Mpc C. 500,000 Mpc D. 5000 Mpc E. 1000 Mpc
What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
A. 980 N B. 200 N C. 98 N D. 49 N E. Some value other than those given above.
Rivers tend to flow
A) southward. B) downhill due to gravity. C) northward. D) toward the Equator.
A stone on the edge of the tire of a unicycle wheel with a radius of 0.25 m has a centripetal acceleration of 4.0 m/s2. What is the tire's angular speed?