A 50-watt sodium lamp emits yellow light at 550 nm. Assuming each photon ejects one electron via the photoelec?
A 50-watt sodium lamp emits yellow light at 550 nm. Assuming each photon ejects one electron via the photoelectric effect, how many electrons per second will be ejected from a metal surface?
Watt = Joule per second.
So the lamp emits 50 J of energy in 1 second.
Energy of 1 photon = h c / (wavelength)
= 6.626 * 10^-34 * 3 * 10^8 / (550 * 10^-9)
= 3.614 * 10^-19 J
Let n photons be emitted each second.
So
total energy = 3.614 n * 10^-19 J
This energy is the energy emitted by the lamp in 1 second.
So
3.614n * 10^-19 J = 50 J
n = 1.38 * 10^20
Each photon ejects one electron.
So no. of electrons ejected is 1.38 * 10^20 per second.
Hope this helps.
your_guide123@yahoo.com
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