The equation of a plane progressive wave is given by $\mathrm{y}=0.025\sin (100\mathrm{t}+0.25\mathrm{x})$. The frequency of this wave would be

• A

  $\frac{50}{\mathrm{\pi }}\mathrm{Hz}$

• B

  $\frac{100}{\mathrm{\pi }}\mathrm{Hz}$

• C

  100 Hz

• D

  50 Hz