In household appliances,which waves are used to operate remote control switches?

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

If the frequencies of $X$-rays,$\gamma$-rays,and ultraviolet rays are $a, b$,and $c$ respectively,then which of the following is correct?

Which of the following electromagnetic waves has the lowest frequency?

The correct ascending order of the wavelengths of the following electromagnetic waves is: Ultraviolet,$X$-rays,infrared,gamma rays,and 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 $1 \ nm$