On a bright and sunny day, the intensity of solar radiation on the Earth's surface is 1 000 W/m2 . If the average wavelength of the sunlight is 500 nm, how many photons are incident on a square meter of the Earth's surface per second?


2.51 × 10^21 photons/s

Physics & Space Science

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Recall that an up quark (u) has a charge of +2/3 and a down quark (d) has a charge of -1/3. Which of the following quark compositions describes a proton?

A) uuu B) uud C) udd D) uuudd

Physics & Space Science

An uncharged spherical conducting shell surrounds a charge ?q at the center of the shell. Then charge +3q is placed on the outside of the shell. When static equilibrium is reached, the charges on the inner and outer surfaces of the shell are, respectively,

A. +q, ?q. B. ?q, +q. C. +q, +2q. D. +2q, +q. E. +3q, 0.

Physics & Space Science

If we add 700 J of heat to 12 moles of an ideal monatomic gas at constant volume, what will be the change in temperature of the gas? (R = 8.31 J/mol ? K)

A) 4.7 K B) 5.2 K C) 5.8 J D) 6.8 K E) 9.3 K

Physics & Space Science

The Milky Way galaxy has collided with several other large galaxies in its lifetime

a. True b. False Indicate whether the statement is true or false

Physics & Space Science