A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1 000 W/m2 sunlight. What is the efficiency of the solar cell?

a. 16%
b. 7%
c. 23%
d. 4%
e. 32%


A

Physics & Space Science

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The Moon is about one-quarter the diameter of Earth. How does its mass compare?

A. The Moon is 1/81 as massive as Earth. B. The Moon is 1/4 as massive as Earth. C. The Moon is 1/6 as massive as Earth. D. The Moon is 1/32 as massive as Earth.

Physics & Space Science

As originally stated, the Copernican model did no better job of predicting planetary behavior than did the Ptolemaic one

Indicate whether the statement is true or false

Physics & Space Science

Instructions: On occasion, the notation will be a shorthand notation for .

Which statement is true about the unit vectors and ? A.

Their directions are defined by a left-handed coordinate system.

B.
The angle between any two is 90 degrees.

C.
Each has a length of 1 m.

D.
If  is directed east and  is directed south,  points up out of the surface.

E.
All of the above.

Physics & Space Science

Without the protection of the Earth's magnetic field, most of the atmosphere would by now have

A) been lost into space B) frozen onto the surface C) dissolved in the oceans D) been destroyed by chemical reactions

Physics & Space Science