Cellular phones use radio waves to transmit voice communication in the . . . . . . band.

Which of the following radiations of electromagnetic waves has the highest wavelength?

What is called as the electromagnetic spectrum?

Match List $I$ with List $II$ of electromagnetic waves with their corresponding wavelength ranges:

List $I$	List $II$
$(A)$ Microwave	$(I)$ $400\,nm$ to $1\,nm$
$(B)$ Ultraviolet	$(II)$ $1\,nm$ to $10^{-3}\,nm$
$(C)$ $X$-Ray	$(III)$ $1\,mm$ to $700\,nm$
$(D)$ Infra-red	$(IV)$ $0.1\,m$ to $1\,mm$

Choose the correct answer from the options given below:

$X$-rays and gamma rays are both electromagnetic waves. Which of the following statements is true?

The frequency range from $3\, MHz$ to $30\, MHz$ is known as: