The rare-Earth hypothesis would predict that the factor flife, in the Drake equation should be close to

A) 0
B) 0.25
C) 1
D) 0.5


A

Physics & Space Science

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How far above the horizon is the Moon when its image reflected in calm water is completely polarized? (nwater = 1.333)

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A photocathode whose work function is 2.9 eV is illuminated with white light that has a continuous wavelength band from 400 nm to 700 nm

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In the SI, weight is expressed in units of ______________

Fill in the blank(s) with correct word

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If a person in Alaska were locked out of his house on a day when the temperature outside was ?40°C, his thick clothing would mostly reduce the loss of thermal energy by

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