A photosensitive surface is illuminated with both blue and violet light. The light that causes the greater number of ejected electrons is
A) blue light.
B) violet light.
C) both eject equal numbers.
D) need more information
Answer: D
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Earth's rotation axis ____________________ slowly so that in a few thousand years Polaris will no longer be the North Star
Fill in the blank(s) with correct word
Refer to Figure 6-11. Block A has a mass of 2.00 kg and rests on a rough table and is connected to block B, which has a mass of 3.00 kg, after passing over an ideal pulley, as shown. Block B is released from rest. The coefficient of kinetic friction between block A and the table is 0.300. What is the acceleration of the masses?
A. 6.54 m/s2 B. 3.92 m/s2 C. 4.71 m/s2 D. 0.981 m/s2 E. 5.89 m/s2
Carl has a 5-inch refracting telescope, and Jim has a 3-inch reflecting telescope. Whose telescope has a higher light-gathering power?
A. Carl's, because lenses gather more light. B. Carl's, because the larger the diameter, the more light to be collected. C. Jim's, because the smaller the diameter, the more light to be collected. D. Jim's, because mirrors gather more light.
When a magnetic field causes a charged particle to move in a circular path, the only quantity listed below which the magnetic force changes significantly as the particle goes around in a circle is the particle's:
a. energy. b. momentum. c. radius for the circle. d. time to go around the circle once.