Figure shows a plot of stopping potential (V0) with frequency (v) of i

1.	Figure shows a plot of stopping potential (V0) with frequency (v) of incident radiation for two photosensitive materials M1 and M2. Explain(i) Why the slope of both the lines is same ?(ii) For which material emitted electrons have greater kinetic energy for the same frequency of incident radiation ?
Answer» (i) Slope of the graph between V₀ and v (from Einstein s equation) equals (h/e). Hence it does not depend on the nature of the material. (ii) Emitted electrons have greater energy for material M₁. This is because ϕ₀ (= hv_o) has a lower value for material M₁.

Figure shows a plot of stopping potential (V0) with frequency (v) of incident radiation for two photosensitive materials M1 and M2. Explain(i) Why the slope of both the lines is same ?(ii) For which material emitted electrons have greater kinetic energy for the same frequency of incident radiation ?

Answer»

(i) Slope of the graph between V₀ and v (from Einstein s equation) equals (h/e). Hence it does not depend on the nature of the material.

(ii) Emitted electrons have greater energy for material M₁. This is because ϕ₀ (= hv_o) has a lower value for material M₁.