If V1 and V2 are stopping potentials for...

If `V_1 and V_2` are stopping potentials for incident photons of wavelengths `lambda_1 andlambda_2` for same cathode material, then Planck's constant is given by [e = charge on electron, c = speed of light]

`e/c(V_2-V_1)(lambda_1lambda_2)/(lamda_1-lambda_2)`

`e/c(lambda_1-lambda_2)(V_1V_2)/(V_1-V_2)`

`e/c(V_2V_1)/(lambda_1lambda_2)`

`e/c(((lambda_1+,lambda_2)))/((V_1+V_2))`

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