The chromosphere is faint because of its low density
Indicate whether the statement is true or false
TRUE
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The wavelength of a light beam is doubled. Which one of the following is correct for the momentum of photons for that light beam?
A) It is halved. B) It stays the same. C) It is doubled. D) It is reduced by one-fourth E) It is quadrupled.
Three Carnot engines operate between temperature reservoirs as follows: Engine A: Th = 1300 K, Tc = 1000 K; Engine B: Th = 1000 K, Tc = 700 K; Engine C: Th = 500 K, Tc = 350 K. Which two engines have the same thermal efficiency?
a. A and B b. B and C c. A and C d. No two have the same thermal efficiency.
The mass of a visual binary pair of stars can be obtained from
a. the time in years for them to orbit one another. b. the size of their orbit. c. their apparent magnitudes. d. both the time in years for them to orbit one another and the size of their orbit.
A 0.20-kg block rests on a frictionless, level surface and is attached to a horizontally aligned spring with a spring constant of 80 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. What is the speed of the block when it passes through the equilibrium point?
a. 2.1 m/s c. 0.80 m/s b. 1.6 m/s d. 0.57 m/s