Q. The magnetic field in a plane electromagnetic wave is given by $B_{y} = 2 \times 10^{- 7}\sin{(0.5 \times 10^{3}x + 1.5 \times 10^{11}t)}$ This electromagnetic wave is
A) A visible light
B) An infrared wave
C) A microwave
D) A radio wave
Explanation
(c) $K = 0.5 \times 10^{3}$
$\frac{2\pi}{\lambda} = 0.5 \times 10^{3} \Rightarrow \lambda = \frac{2\pi}{0.5} \times 10^{- 3}$
$\lambda = 12.76mm$
$\lambda$ lies in range of microwave
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.