If lambda0 is the Threshold wavelength ...

If ` lambda_0` is the Threshold wavelength of a metal for photo-electron emission . If the metal is exposed to the light of wavelength ` lambda` then the velocity of ejected electron will be ` sqrt ((2h)/m ( lambda_0 - lambda) K )`. The value of (K) is :

speed of light

`C/(lamda_0lamda)`

`1/(lamdalamda_0)`

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