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A photon of wavelength 4xx 10^(-7) m st...

A photon of wavelength ` 4xx 10^(-7)` m strikes on metal surface. The work funcation of the metal being 2.13eV. Calculate (i) the energy of the photon (eV) . (ii) the kinetic energy of the emission, and (ii) the velcoity of the photoelectron `(1 eV= 1.6020 xx 10^(-19) J )`

Text Solution

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(A) Energy of photon `(E)=hv=(hc)/(lambda)=((6.626xx10^(-34)Js)xx(3xx10^(8)ms^(-1)))/(4xx10^(-7)m)=4.97xx10^(-19)J`
`=(4.97xx10^(-19))/(1.602xx10^(-19))eV=3.10eV`
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