Energy flux of sunlight = Total energy per square metre per second = 1.388 x 103 Wm–2
Energy of each photon is given by,
Therefore,
Number of photons incident on earth's surface per square metre per second is,
Given,
Power, P (power) = 100 W
Wavelength of sodium light, λ = 589 x 10–9 m
(a) Energy of each photon assosciated with the sodium light,
(b) Number of photons delivered to sphere per second,
As, P= nE
In an experiment on photoelectric effect, the slope of the cut-off voltage versus frequency of incident light is found to be 4.12 x 10–15 Vs.
Calculate the value of Planck's constant.