The sun has a surface temperature of approximately 5800 K. At what wavelength does the maximum energy radiated by the sun occur?
a. 5800 nm
b. 300 nm
c. 174 nm
d. 520 nm
e. 3000 nm
D
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An ice cube with a small solid steel sphere frozen inside floats in a glass of water filled to the brim. What happens to the level of water in the glass as a result of the ice melting?
a. It goes up, overflowing. b. It stays the same. c. It goes down. d. It depends on air pressure, thus the answer is indeterminate.
For electric power that costs 10 cents per kilowatt hour, the cost of operating a 110-V heater that uses 20 A for 10 hours is
A) $0.22. B) $0.55. C) $2.20. D) $5.50. E) none of the above
Inside the nucleus, the weakest of the four fundamental forces is
A) the electromagnetic force. B) the gravitational force. C) the weak nuclear force. D) the strong nuclear force.
A parallel-plate capacitor is attached to a fixed voltage supply. If the plates are then separated to double the initial value, what happens to the energy stored by the capacitor?
a. It halves, go figure! b. It stays the same since the volume doubles while the electric field halves. c. It doubles since the volume between the plates doubles. d. It quadruples since both the volume and the field double in this case.