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The threshold frequency v(0) for a meta...

The threshold frequency `v_(0)` for a metal is `7.0xx10^(14)s^(-1)` . Calculate the kinetic energy of an electron emitted when radiation of frequency `v=1.0xx10^(15)s^(-1)` hits the metal .

Text Solution

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According to Einstein.s equation.
Kinetic energy `=1//2m_(e)v^(2)=h(v-v_(0))`
`=(6.626xx10^(-34)Js)`
`(1.0xx10^(15)s^(-1)-7.0xx10^(14)s^(-1))`
`=(6.626xx10^(-34)Js)`
`=(6.626xx10^(-34)Js)`
`(3.0xx10^(14)s^(-1))=1.988xx10^(-19)J`
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