In a plane electromagnetic wave, the magnetic field is given by $\vec{B}=3 \times 10^{-7} \sin \left(100 \pi x+10^{12} t\right) T$, then the wavelength of the wave is (In the equation $x$ is in metre and $t$ is in second)

• Correct answer
  A

  0.02 m
• B

  0.2 m
• C

  0.4 m
• D

  0.04 m

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