Which of the following is an electromagnetic wave?

Electromagnetic radiation of highest frequency is

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$(a)$ Source of microwave frequency	$(i)$ Radioactive decay of nucleus
$(b)$ Source of infrared frequency	$(ii)$ Magnetron
$(c)$ Source of Gamma Rays	$(iii)$ Inner shell electrons
$(d)$ Source of $X$-rays	$(iv)$ Vibration of atoms and molecules
	$(v)$ $LASER$
	$(vi)$ $RC$ circuit

Choose the correct answer from the options given below:

Which of the following electromagnetic waves has the shortest wavelength?

Match the List-$I$ with List-$II$:

List-$I$	List-$II$
$A$. Microwaves	$I$. Radioactive decay of the nucleus
$B$. Gamma rays	$II$. Rapid acceleration and deceleration of electrons in aerials
$C$. Radio waves	$III$. Inner shell electrons
$D$. $X$-rays	$IV$. Klystron valve

Choose the correct answer from the options given below:

The magnetic field in a plane electromagnetic wave is given by $B = 2 \times 10^{-7} \sin(0.5 \times 10^3 x + 1.5 \times 10^{11} t)$. This electromagnetic wave is .........