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Electrons are emitted with zero vel...

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800A . Calculate threshold frequency `(V_(0))` and work function `(W_(0)) ` of the metal.

Text Solution

Verified by Experts

Where `lambda = 6800 A = 6800 xx 10^(10) m = 6.8 xx 10^(7) m`
Work function `(W_(0)) = hv_(0) ` but `v=(c )/(lambda)`
Threshold frequency
`(V_(0)) = (W_(0))/( h) = (2.923 xx 10^(19))/( 6.626 xx 10^(34) J s)`
`=4.411 xx 10^(14) s^(1)`
`4.411 xx 10^(14) Hz`
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