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

Answer 1

Answer: (C)

Wavelength order of given rays are listed below:

Rays	Wavelength $\mathring{A}$
Visible light	$4000-7900$
X-rays	$1-100$
Microwaves	$10^7-10^9$

Obviously, ${\lambda }_x<{\lambda }_v<{\lambda }_m$
or ${\lambda }_m>{\lambda }_v>{\lambda }_x$
NOTE : Visible light, X-rays and microwaves are all electromagnetic waves.