The variation of photo-current with collector potential for different frequencies of incident radiation v1, v2 and v3 is as shown in the graph, then

Question

The variation of photo-current with collector potential for different frequencies of incident radiation v1, v2 and v3 is as shown in the graph, then (A) v1= v2 = v3 (B) v1 > v2 > v3 (C) v1< v2 < v3 (D) v3 = (v1 + v2/2)

Tardigrade Admin · Accepted Answer

Key Idea The smaller the incident frequency, the smaller the stopping voltage required. <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/51faa00f782df858bafa3fa9933b12e1-.png" /> ∴ v3 > v2 > v1.

Q. The variation of photo-current with collector potential for different frequencies of incident radiation $v_{1}, v_{2}$ and $v_{3}$ is as shown in the graph, then

$v_{1} = v_{2} = v_{3}$

$v_{1} > v_{2} > v_{3}$

$v_{1} < v_{2} < v_{3}$

$v_{3} = \frac{v _{1} + v _{2}}{2}$

Key Idea The smaller the incident frequency, the smaller the stopping voltage required.

$∴ v_{3} > v_{2} > v_{1} .$

Q. The variation of photo-current with collector potential for different frequencies of incident radiation v1​,v2​ and v3​ is as shown in the graph, then

v1​=v2​=v3​

v1​>v2​>v3​

v1​<v2​<v3​

v3​=2v1​+v2​​