Answer :
The maximum velocity of electrons ejected 1.95*10^6 m/s
What is electrons ejected ?
The photoelectric effect is a phenomena wherein electrons can be released from the surface of a metal when light shines on it. The electrons that are released from the metal are known as photoelectrons, and this process is also sometimes referred to as photoemission.
Energy of photon (E) = h*c / λ
where
h = plank's constant
c = velocity of light
λ = wavelength of light
(E) = h*c / λ
= 6.625*10^-34*3*10^8/(80*10^-9)
= 2.484*10^-18 J
Work function of the material,
Wo = 4.73*1.6*10^-19
= 7.568*10^-19 J
Use Einstein's equation
E = Wo + KEKE
= E - Wo0.5*m*v^2
= E - Wov = sqrt(2*(E-Wo)/m)
= sqrt(2*(2.484 - 0.7568)*10^-18/(9.1*10^-31))
= 1.95*10^6 m/s
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