If a 3-meter diameter telescope is doubled in size, then its new light collecting power would
A. double.
B. increase by a factor of four.
C. reduce by half.
D. not change.
Answer: B
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Suppose that the energy difference between adjacent energy levels for an oscillator in an Einstein solid is ? = 0.005 eV. At room temperature, the value of T/TE is
A. quite a bit smaller than 1 B. about equal to 0.5. C. about equal to 1. D. about equal to 2. E. quite a bit larger than 2. F. One doesn’t have enough information to tell.
The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. What net force would be required to accelerate a 25.0-kg object at 5.80 m/s2 on the Moon?
a. 4.31 N b. 24.2 N c. 8.7 N d. 145 N e. 25.9 N
A refrigerator has a coefficient of performance of 4 . If the refrigerator absorbs 30 cal of heat from the cold reservoir in each cycle, the heat expelled (in cal) into the heat reservoir is
a. 40.5 b. 37.5 c. 36.5 d. 34.5 e. 22.5
A 29.0 pm wavelength photon is scattered by a stationary electron. The maximum energy loss of the photon is closest to:
A) 4 KeV B) 6 KeV C) 10 KeV D) 12 KeV E) 15 KeV