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Radiation of wavelength 310 nm is incide...

Radiation of wavelength 310 nm is incidenton a metal surface of work function `1eV`. Find maximum speed of photoelectrons emitted . ( Closed value )

A

`10 ^(6) m//s`

B

` 10^(8)m//s`

C

` 10^(7) m//s`

D

`10^(5) m//s`

Text Solution

Verified by Experts

`(K.E.)_("max") =(hc)/( lambda) - phi `, `(K.E.) _("max") = ((1240)/(310) - 1) eV = 3eV`
`3 xx 1.6xx 10^(-19) = ( 1)/( 2) mV^(2) ( m = 9.1 xx 10^(-31) k g) `
`V ~~ 10^(6) m//s`
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