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
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,
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.