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
b
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Energy Conservation With Conservative Forces: In the figure, a ball hangs by a very light string. What is the minimum speed of the ball at the bottom of its swing (point B) in order for it to reach point A, which is 1.0 m above the bottom of the swing?
A. 2.2 m/s B. 3.1 m/s C. 4.4 m/s D. 4.9 m/s
RMS and Peak Quantities: The current through a 50-? resistor is I = (0.80 A) sin(240t), where t is measured in seconds. How much power on average is dissipated in the resistor?
A. 16 W B. 32 W C. 45 W D. 64 W
Based on current evidence, a supercluster is most likely to have formed in regions of space where
A) the density of dark matter was slightly higher than average when the universe was very young. B) there was an excess concentration of hydrogen gas when the universe was very young. C) supermassive black holes were present in the very early universe. D) the acceleration of the expansion was proceeding faster than elsewhere.
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C A 1 kg block of ice is removed from a freezer where its temperature was –10°C. The amount of heat absorbed by the ice as it warms to 0°C is
a. 2,000 J. b. 4,000 J. c. 20,000 J. d. 40,000 J. e. 334,000 J.