A horizontally-projected beam of electrons travelling at 55 km/s travels between two parallel plates separated by 7.4 cm, and 12 cm long, between which there is an electric field of 7.2 mV/m upward. If the beam enters the region at a height of 3.7 cm above the lower plate, at what height above the lower plate is the beam when it exits? The electron mass is

A. 0.9 cm
B. 2.3 cm
C. 5.1 cm
D. 4.6 cm


B. 2.3 cm

Physics & Space Science

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When a gas expands adiabatically,

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Which one of the phrases below is the current explanation of why the surface of Venus is so hot?

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Of these, which is evidence that Mars once had running water on its surface?

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Listed following are several objects in the solar system. Rank these objects from left to right based on their orbital period around the Sun from shortest to longest.

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