The amplitude of the electric field associated with a light beam of intensity $\frac{15}{\pi} \mathrm{Wm}^{-2}$ is

• A

  $120 \mathrm{NC}^{-1}$
• B

  $15 \mathrm{NC}^{-1}$
• Correct answer
  C

  $60 \mathrm{NC}^{-1}$
• D

  $30 \mathrm{NC}^{-1}$

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