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If the work function of a and is 3 eV, c...

If the work function of a and is 3 eV, calculate the threshold wavelength of that metal.
(Velocity of light `=3xx10^(8)m//s` Planck's constant= `6.63xx10^(-34)J-s,1eV=1.6xx10^(-19)`)

Text Solution

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Given `W_(0)=3eV=3xx1.6xx10^(-19)J=4.8xx10^(-19)J,h=6.63xx10^(-34)Js, c=3xx10^(8)m//s`
Threshold wavelength `(lamda_(0))`
`=(hc)/(W_(0))`
`=(6.63xx10^(-34)xx3xx10^(8))/(4.8xx10^(-19))`
`=4.14xx10^(-7)m`.
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