Question

If ${\lambda }_v,{\lambda }_x$ and ${\lambda }_m$ represent the wavelengths of visible light, $X-$ rays and microwaves respectively, then -

• A. ${\lambda }_m>{\lambda }_x>{\lambda }_v$
• B. ${\lambda }_m>{\lambda }_v>{\lambda }_x$
• C. ${\lambda }_v>{\lambda }_x>{\lambda }_m$
• D. ${\lambda }_v>{\lambda }_m>{\lambda }_x$

Answer 1

The correct option is B ${\lambda }_m>{\lambda }_v>{\lambda }_x$

We know that -

Serial No.	Type of radiation	Wavelength range
$1$	$X-$ rays	$\sim {10}^{-8}\text{m}-{10}^{-12}\text{m}$
$2$	Visible light	$\sim {10}^{-7}\text{m}$
$3$	Microwaves	$\sim {10}^{-1}\text{m}-{10}^{-3}\text{m}$

From the above table, we can see that, ${\lambda }_m>{\lambda }_v>{\lambda }_x$

Hence, option $\left(B\right)$ is the correct answer.