Question

Statement-1 : A metallic surface is irradiated by a monochromatic light of frequency $v>v_0$ (the threshold frequency). The maximum kinetic energy and the stopping potential are $K_{\max }$ and $V_0$ respectively. If the frequency incident on the surface is doubled, both the $K_{\max }$ and $V_0$ are also doubled.

Statement-2 : The maximum kinetic energy and the stopping potential of photoelectrons emitted from a surface are linearly dependent on the frequency of incident light.

• A. Statement- 1 is false, Statement-2 is true
• B. Statement- 1 is true, Statement- 2 is false
• C. Statement-1 is true, Statement-2 is true and Statement-2 is a correct explanation for Statement-1
• D. Statement-1 is true, Statement-2 is true and Statement- 2 is not the correct explanation of Statement-1

Answer 1

Answer: (A)

$k_{\max }=hf-\varphi$
$k_{\max }^{\prime }=2hf-\varphi$
$k_{\max }^{\prime }=2k_{\max }+\varphi$
$k_{\max }^{\prime }>2k_{\max }$