What gets left behind in the middle of a planetary nebula?
A.) A newborn star.
B.) A white dwarf.
C.) A neutron star.
D.) A black hole.
E.) None of the above.
Ans: B.) A white dwarf.
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What is the maximum velocity (in km/s) 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. 460 b. 650 c. 420 d. 550 e. 1 480
Doppler Effect: What is the frequency does a stationary observer hear when a train approaches her with a speed of 30 m/s. The frequency of the train horn is 0.600 kHz and the speed of sound is 340 m/s.
A. 551 Hz B. 600 Hz C. 653 Hz D. 658 Hz
A 5.0 ?C charge is placed at the 0 cm mark of a meter stick and a -4.0 ?C charge is placed at the 50 cm mark. At what point on a line joining the two charges is the electric field zero?
A) 1.4 m from the 0 cm mark B) 2.5 m from the 0 cm mark C) 2.9 m from the 0 cm mark D) 3.3 m from the 0 cm mark E) 4.7 m from the 0 cm mark
In order for two objects to have the same temperature, they must
a. be in thermal equilibrium. b. be in thermal contact with each other. c. have the same relative "hotness" or "coldness" when touched. d. have all of the properties listed above. e. have only properties (b) and (c) above.