Photon Momentum: If the frequency of a light beam is doubled, what happens to the momentum of the photons in that beam of light?
A. It stays the same.
B. It is halved.
C. It is doubled.
D. It is reduced to one-fourth of its original value.
E. It is increased to four times its original value.
Answer: C
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Which of the following correctly compares the Sun's energy generation process to the energy generation process in human-built nuclear power plants?
A) The Sun generates energy by fusing small nuclei into larger ones, while our power plants generate energy by the fission (splitting) of large nuclei. B) Both processes involve nuclear fusion, but the Sun fuses hydrogen while nuclear power plants fuse uranium. C) The Sun generates energy through nuclear reactions while nuclear power plants generate energy through chemical reactions. D) The Sun generates energy through fission while nuclear power plants generate energy through fusion.
A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the lowest point on the circle, the speed of the mass is 12 m/s. What is the magnitude of the force of the string on the mass at this position?
A. 31 N B. 36 N C. 41 N D. 46 N E. 23 N
A student adds two displacement vectors that have the magnitudes of 12.0 m and 5.0 m. What is the range of possible answers for the magnitude of the resultant vector?
What will be an ideal response?
Two small objects, with masses m and M, are originally a distance r apart, and the magnitude of the gravitational force they exert on each one is F. The masses are changed to 2m and 2M, and the distance is changed to 4r
What is the magnitude of the new gravitational force? A) F/16 B) F/4 C) 16F D) 4F E) F/2