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.