In the U.S. AC line voltage oscillates at a frequency of
a. 50 Hz c. 120 Hz
b. 60 Hz d. none of the above
B
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Cepheid and RR Lyrae variable stars change their brightness by ____
a. atmospheric explosions of hydrogen gas b. internal changes in their fusion processes c. a combination of atmospheric explosions and internal changes d. a combination of atmospheric explosions and physically pulsating e. changing its period between pulses
If you were caught in freezing weather with only a candle for warmth, you would be warmer in
A) an igloo. B) a tent. C) a wooden house.
A person consumes a snack containing 14 food calories (14 kcal). What is the power this food produces if it is to be "burned off" due to exercise in 6 hours? (1 cal = 4.186 J)
A) 0.0027 W B) 9763 W C) 2.7 W D) 0.6 W
For the ion He+, what is the energy of the ground state?
A. -13.6 eV B. -27.2 eV C. -54.4 eV D. -6.80 eV E. -3.40 eV