The radius of the Sun is 6.95 × 108 m. It radiates heat at the rate of 5.32 x 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of the Sun? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4)
A) 6.27 × 103 K
B) 8.25 × 103 K
C) 8.87 × 103 K
D) 3.93 × 107 K
E) 5.78 × 107 K
A
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Will a blackbody at temperature T emit more photons per second with energy 0.5 kBT or with energy 1.5 kBT?
A. It will emit more photons with the lower energy. B. It will emit more photons with the higher energy. C. The number of photons emitted will be the same. D. One has no way of telling.
For a BCC crystal, which of the following x-ray (hkl) diffraction peaks is not present?
(a) (200) (b) (110) (c) (130) (d) (111)
One line of evidence supporting the big bang theory is
A) the nuclear fission products observed in our galaxy are just what is predicted by the big bang theory. B) the density of galaxies observed in the universe is just what is predicted by the big bang theory. C) the observed abundance of very heavy elements in our galaxy is just what is predicted by the big bang theory. D) neutron stars have just the masses and frequencies of rotation that are predicted by the big bang theory. E) the observed abundance of very light elements in our galaxy is just what is predicted by the big bang theory.
Different units can be used to measure the same physical quantity, differing only by some multiplicative factor. The cgs unit for magnetic field, the gauss, is equal to ________ tesla
a. 104 b. 10–4 c. 0.5 d. These units do not measure the same physical quantity.