X–rays of frequency v are used to iridates sodium and aluminium surf

1.	X–rays of frequency v are used to iridates sodium and aluminium surfaces in two separate experiments and the stopping potential determined (1) The value of stopping potential is same for both sodium and aluminium surfaces.(2) The value of stopping potential is more for aluminium than for sodium. (3) The stopping potential is more for sodium than for aluminium. (4) The stopping potential also depends on the intensity of light used which is not specified in the question so, one cannot say which of the two metals will have a greater value for stopping potential
Answer» Correct option : (3) Explanation : From the relation eVs = hv - ω₀ it is clear that the value of stopping potential for a given metal depend upon ω₀ when a light of frequency v is incident on a metal surface. Now ω₀ for sodium is 2.0 and ω₀ for aluminum is 4.2 The metal surface having lower value of work function will have a larger value of stopping potential.

X–rays of frequency v are used to iridates sodium and aluminium surfaces in two separate experiments and the stopping potential determined (1) The value of stopping potential is same for both sodium and aluminium surfaces.(2) The value of stopping potential is more for aluminium than for sodium. (3) The stopping potential is more for sodium than for aluminium. (4) The stopping potential also depends on the intensity of light used which is not specified in the question so, one cannot say which of the two metals will have a greater value for stopping potential

Answer»

Correct option : (3)

Explanation :

From the relation eVs = hv - ω₀

it is clear that the value of stopping potential for a given metal depend upon ω₀ when a light of frequency v is incident on a metal surface.

Now ω₀ for sodium is 2.0 and ω₀ for aluminum is 4.2

The metal surface having lower value of work function will have a larger value of stopping potential.