mahima pareek
Last Activity: 6 Years ago
The expression for pressure exerted when there is reflection and absorption is
P = I(1 + r) /c
Where P = pressure exerted
I = intensity of the incident light
r = reflection coefficient
c = speed of light
Here r = 100 - 75/100 = 0.25
Now 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/At
So our formula for pressure becomes
P =( The thing which is asked) E(1 + 0.25)/c
Now 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
