monochromatic beam of light of wavelength 663nm i

Question

monochromatic beam of light of wavelength 663nm is incident normal to the surface produces a pressure of 10^-6 N/m^2. the surface absorbs 75% of light and reflects the rest. find the number of photons per unit area per second:

mahima pareek · Accepted Answer

The expression for pressure exerted when there is reflection and absorption is P = I(1 + r) /cWhere P = pressure exerted I = intensity of the incident light r = reflection coefficient c = speed of lightHere r = 100 - 75/100 = 0.25Now we know I = nE/Atc Where. n = no. of photons incident E = energy of each photon A = area of the metal plate t = time of incidence of photons Now we are given P and asked about n/AtSo our formula for pressure becomes P =( The thing which is asked) E(1 + 0.25)/cNow n/At = Pc/E(1.25) Answer is probably 9.84 * 10 to the power 20 PS i did not solve it as I don't have special characters in phone Approve if the asnwer is correct

Modern Physics> monochromatic beam of light of wavelength...

monochromatic beam of light of wavelength 663nm is incident normal to the surface produces a pressure of 10^-6 N/m^2. the surface absorbs 75% of light and reflects the rest. find the number of photons per unit area per second:

Farhan , 7 Years ago

mahima pareek

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Modern Physics> monochromatic beam of light of wavelength...

monochromatic beam of light of wavelength 663nm is incident normal to the surface produces a pressure of 10^-6 N/m^2. the surface absorbs 75% of light and reflects the rest. find the number of photons per unit area per second:

Farhan , 7 Years ago

mahima pareek

LIVE ONLINE CLASSES

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