The pressure variation that correspond to pain threshold (i.e., the ear can tolerate in loud sound) is about 30 pa. Velocity of sound in water is $\sqrt{2} \times {10}^3$ m/s. The intensity of sound wave produced in water corresponding to loud sound is

• A

  1 $\mathrm{W}/{\mathrm{m}}^2$

• B

  $0.3\times {10}^{-3} \mathrm{W}/{\mathrm{m}}^2$

• C

  ${10}^3\mathrm{W}/{\mathrm{m}}^2$

• D

  ${10}^{-12}\mathrm{W}/{\mathrm{m}}^2$