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In a photocell circuit the stopping pote...

In a photocell circuit the stopping potential, `V_0`, is a measure of the maximum kinetic energy of the photoelectrons. The following graph shows experimentally measured values of stopping potential versus frequency v of incident light.

The values of Planks constant and the work function as determined from the graph are (taking the magnitude of electronic charge to be `e= 1.6 xx 10^(-19)C`)

A

`6.4 xx10^(-34) Js,2.0 eV`

B

`6.0 xx10^(-34) Js,2.0 eV`

C

`6.4 xx10^(-34) Js,3.2 eV`

D

`6.0 xx10^(-34) Js,3.2 eV`

Text Solution

Verified by Experts

The correct Answer is:
B
`V=(hv)/e-phi`
Hence from graph `phi=2eV`
`h/e` = Slope
`=6/(1.6 xx10^(15))implies h=(6xx1.6 xx10^(-19))/(1.6 xx10^(15))=6.0 xx10^(-34)`
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