A silver ball is suspended by a string in vaccum chamber and UV light of wavelength 200nm is directed at it. what electric potential will the ball aquire as aresult?
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A silver balll is suspended by a string in a vacuum chamber and ultraviolet light of wavelength 2000Å is directed at it. What electrical potential will the ball acquire as a result? Work function of silver is 4.3 eV. Therefore, stopping potentia is 1.9 V.
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Energy of photon E=1242/λ(nm) eV=1242/200=6.2eV
E=ϕ+Kmax
6.2=4.7+Kmax⇒Kmax=1.5eV=eVs
Stopping potential Vs=1.5V
The electron will be ejected until potential of sphere equals stopping potential
V=Vs=1.5V
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