If lamda(0) and lamda be the threshold w...

If `lamda_(0)` and `lamda` be the threshold wavelength and the wavelength of incident light, the speed of photo-electrons ejected from the metal surface is:

`sqrt((2hc)/(m)((lambda_(o)-lambda)/(lambda lambda_(o)))`

`sqrt((2hc)/(m)((lambda_(o)-lambda))`

`sqrt((2h)/(m)(lambdao-lambda))`

`sqrt((2h)/(m)((1)/(lambda_(o))-(1)/(lambda)))`

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