For photoelectric effect in a metal, the figure shows the plot of cut off voltage versus frequency of incident radiations. Calculate
(a) the threshold frequency
(b) the work function for given metal.

In an experiment on photoelectric effect, the slope of the cut-off voltage versus frequency of incident light is found to be 4.12 xx 10^-15 Vs . Calculate the value of Planck's constant.

Given instructions same as in chapter 1. Assertion: For photoelectric effect to take place, the frequency of incident of incident radiations should be more than threshold frequency of a given metal Reason: 1/2 mv^2=h(v-v_0) .

Electrons ar emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 A^(@). Calculate threshold frequency (v _(0)) and work function (w) of the metal.