The displacement x (in metre) of a particle in, simple harmonic motion is related to time t (in seconds) as
    $\mathrm{x}=0.01\cos \left(\mathrm{\pi }\mathrm{t}+\frac{\mathrm{\pi }}{4}\right)$
The frequency of the motion will be

• A

  0.5 Hz

• B

  1.0 Hz

• C

  $\frac{\mathrm{\pi }}{2}\mathrm{Hz}$

• D

  $\mathrm{\pi }\mathrm{Hz}$