The minimum energy that a photon must have to undergo pair production is
A. 0.511 MeV.
B. 1.022 MeV.
C. 2.044 MeV.
D. 0.256 MeV.
E. any amount more than zero.
B. 1.022 MeV.
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The two most abundant elements in the sun are
a. nitrogen and oxygen. b. hydrogen and helium. c. sulfur and iron. d. carbon and hydrogen. e. carbon and nitrogen.
A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80 
downward. What is the maximum height?
A. 22.3 m B. 27.5 m C. 30.5 m D. 36.7 m E. 20.0 m
What mass would have to be condensed to a radius of 1.0 × 10-15 m (the order of magnitude of the radius of an atomic nucleus) in order for it to become a black hole? G = 6.67 × 10-11 Nm2/kg2
A) 1.1 × 10-6 kg B) 4.1 × 10-8 kg C) 2.2 × 103 kg D) 6.7 × 1011 kg E) 8.3 × 1015 kg
A Doppler red shift indicates
a. a shift toward lower frequencies. b. a shift toward shorter wavelengths. c. that a light source is approaching relative to the observer. d. none of these.