The rate at which photons of wavelength 620 nm must be incident on a surface to deliver total power of 1.0 w is closest to:

3.2 x 10^18

Explanation:

Power, P = 1 W = 1 J/s

wavelength, λ = 620 nm = 620 x 10^-9 m

Energy of each photon, E = hc/λ

where, h is the Plank's constant and c be the velocity of light

E = (6.63 x 10^-34 x 3 x 10^8) / (620 x 10^-9)

E = 3.2 x 10^-19 J

Let n be the number of photons per second

n = Total energy in one second / energy of each photon

n = 1 / (3.2 x 10^-19)

n = 3.2 x 10^18 photons per second

So, the rate of photons is 3.2 x 10^18.

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

the answer would be c