The fact that the cosmic microwave background radiation has almost exactly the same temperature in every direction is referred to as the _______________ problem
Fill in the blank(s) with correct word
horizon
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Let k be the Boltzmann constant. If the thermodynamic state of a gas at temperature T changes isothermally and reversibly to a state with three times the number of microstates as initially, the energy input to the gas as heat is:
A. Q = 0 B. Q = 3kT C. Q = ?3kT D. kT ln 3 E. ?kT ln 3
The amount of light reaching the film in a camera is determined by the
A) shutter speed. B) f-stop. C) focal length of the lens.. D) focusing. E) diameter of the aperture.
Suppose the Sun were to suddenly shrink in size but its mass remained the same. According to the law of conservation of angular momentum, what would happen?
A) The Sun's angular size in our sky would increase. B) The Sun's rate of rotation would slow. C) The Sun's rate of rotation would remain the same. D) The Sun rate of rotation would increase.
Which statement is correct?
A. No systems of multiple exoplanets have been detected. B. No gas giants have been detected orbiting closer than 1 au to their stars. C. No exoplanets have been detected orbiting closer than 1 au to their stars. D. No exoplanets have been detected orbiting binary stars. E. None of these choices are correct.