Where does most of Earth's 14C come from?

A) It was deposited on Earth when the solar system first evolved.
B) It is continually being formed by the impact of cosmic rays on the atmosphere.
C) It is continually being formed as a result of the photosynthesis process
D) It comes to Earth from outer space along with other cosmic rays.
E) It was deposited on Earth many years ago by meteors.


B

Physics & Space Science

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Indicate whether the statement is true or false

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A Carnot air conditioner has a coefficient of performance of 17.0 and removes 72.0 MJ of heat from the interior of a house every hour. How much power does it consume?

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The Hipparcos mission's observations have given us good data on stars out to about:

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