Following graphs show the variation of stopping potential corresponding to the frequency of incident radiation $\left(\mathrm{f}\right)$ for a given metal. The correct variation is shown in graph ( ${\mathrm{f}}_0=$ Threshold frequency)

• Correct answer
  A

  (1)
• B

  (2)
• C

  (3)
• D

  (4)

Hence, the correct answer is option: 'A'.