Question

(a) In free space at a point magnitude of electric field vector $\left(\overrightarrow{E}\right)$ is $9.3V/m$. Find the magnitude of magnetic field vector $\left(\overrightarrow{B}\right)$ at the point.
(b) Out of ultraviolet, infrared and X-rays whose wavelength is maximum?

Answer 1

(a)

Ratio of magnitudes of electric field to magnetic field in an electromagnetic wave equals the speed of light.

$\frac{E}{B}=3\times {10}^8$

$B=\frac{9.3}{3\times {10}^8}$

$B=3.1\times {10}^{-8}T$

(b)

From the attached figure, frequency of X-rays > UV > Infrared