From the mass-luminosity relation, a 2 solar mass star on the main sequence would have a luminosity of approximately ____ solar luminosities
a. 2
b. 4
c. 11
d. 0.5
e. 0.25
C
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Polarization: A beam of light is polarized in a vertical plane and has an intensity I0. The beam passes through an ideal polarizer and then through an ideal analyzer whose axis is set horizontally. If the axis of the polarizer is set at 60° with the vertical, what is the ratio of the intensity of the final beam to I0?
A. 0.19 B. 0.25 C. 0.31 D. 0.37 E. 0.43
Why does the Big Bang theory predict that the cosmic background radiation should have a perfect thermal radiation spectrum?
A) The background radiation came from the heat of the universe, with a peak corresponding to the temperature of the universe. B) The spectrum of pure hydrogen is a perfect thermal radiation spectrum. C) The spectrum of 75 percent hydrogen and 25 percent helium is a perfect thermal radiation spectrum. D) The light from all the stars and gas in the sky averaged over the entire universe is a perfect thermal radiation spectrum. E) It doesn't predict that the cosmic background radiation should have a perfect thermal radiation spectrum.
A reflection nebula appears blue because it scatters the ________ light of the stars near it
Fill in the blank(s) with correct word
The photoelectric effect occurs when electrons are emitted when light strikes the surface of a metal
a. True b. False Indicate whether the statement is true or false