a. What is the significance of Vsop? That is, what have you learned if you measu

Question

a. What is the significance of Vsop? That is, what have you learned if you measure Vnaop? Note: Don't say that " Vop is the potential that causes the current to stop." That is merel definition of Vsep. It doesn't say what the significance of Vuop is. b. Why is it surprising that Vtog is independent of the light intensity? What would you expect Vsp to do as the intensity increases? Explain. c. If the wavelength of the light in a photoelectric effect experiment is increased, does uop increase, decrease, or stay the same? Explain.

Explanation / Answer

a)

stopping potential is a negative potential applied to collector to stop the photo current,

if we keep increasing the V_stop,

then at one point current becomes zero, hence electrons just ejected from metal surface

V-stop=K.E/q

b)

stopping potential (V_stop) is independent of the light intensity,

here,

if we incresae intensity of the incident light,

then no of photons falling on the metal surface increases, hence more no of photo elecctons will be ejected

but, there is no change in speed of the electrons

if intensity increases, ===> V_stop remain constant

c)

by usinng energy relation,

h*f=h*fo-K.E

(h*C/lambda)=(h*C/lambdao)-(e*V_stop)

if wavelength of the incident light increases,===> V_stop decreases

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