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
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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
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
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.
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