The frequency of a light beam is doubled. Which one of the following is correct for 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 by one-fourth
E) It is quadrupled.
C
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The energy output of a Seyfert galaxy____
a. changes slowly with a period of weeks b. is a hundred times the luminosity of the entire Milky Way c. is noticeable only in the infrared d. comes from starburst effects e. is concentrated in the spiral arms
If a proton with mass 1.67 × 10^?27 kg moves in an accelerator such that its total energy is three times its rest energy, what is its speed? (c = 3.00 × 10^8 m/s)
a. 2.83 × 10^8 m/s b. 2.45 × 10^8 m/s c. 2.00 × 10^8 m/s d. 1.00 × 10^8 m/s e. 1.54 × 10^8 m/s
Which of the following statements is true of stars?
A) They die when they exhaust their fuel, allowing gravity to take control. B) The energy generated through nuclear fusion keeps their interiors cool. C) They avoid collapsing by balancing gravity through low pressures. D) The generation of energy from nuclear fusion prevents stars from resisting their own gravity.
Astronomers expect that due to friction and collisions, the particles in Jupiter's ring are slowing down and will eventually spiral into the planet.
Answer the following statement true (T) or false (F)