What is the maximum kinetic energy (in eV) of a photoelectron emitted from a surface whose work function is 5.0 eV when illuminated by a light whose wavelength is 200 nm?
a. 1.9
b. 1.2
c. 3.1
d. zero
e. 6.2
B
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(b) The space time interval between events A and C is:
A. Time like B. Light like C. Space like
What is the binding energy per nucleon for Al? The neutral Al atom has a mass of 26.981539 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has a mass of 1.008665 u; and a proton has a mass of 1.007277 u. 1 u = 931.494 MeV/c2
A) 8.3 MeV B) 6.7 MeV C) 5.4 MeV D) 3.4 MeV E) 2.8 MeV
In 1974, a radio message was sent out from the Arecibo observatory in Puerto Rico. How far has it gotten, approximately?
A) just beyond our Solar System B) not even to the nearest stars C) just a miniscule fraction of the distance across the Milky Way D) almost to the center of the Milky Way E) beyond the Milky Way, to the Andromeda galaxy
A 4.00 kg mass is moving in a circular path of radius 2.50 m with a constant angular velocity of 5.00 rad/sec. The centripetal force on the mass is
A. 250 N. B. 185 N. C. 153 N. D. 107 N. E. 94.0 N.