. . . . . . are used in medicine to destroy cancer cells.

The radiation of frequency $1057 \ MHz$ coming from two close energy levels of hydrogen belongs to which part of the electromagnetic spectrum?

Which of the following waves has the maximum wavelength?

$A$ radar sends waves towards a distant object and receives the signal reflected by the object. These waves are:

Give the range of wavelength of visible light.

Match the following types of waves with their wavelength ranges:

$i$. Microwave	$(a)$. $700 \ nm$ to $400 \ nm$
$ii$. Visible light	$(b)$. $1 \ nm$ to $10^{-3} \ nm$
$iii$. Ultraviolet	$(c)$. $0.1 \ m$ to $1 \ mm$
$iv$. $X$-rays	$(d)$. $400 \ nm$ to $1 \ nm$