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

Physics & Space Science

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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?

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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

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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

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