The energy of the EM waves is of the order of $15~\mathrm{keV}$. To which part of the spectrum does it belong?
1. X-rays
2. Infrared rays
3. Ultraviolet rays
4. $\gamma$-rays

Light with an energy flux of $25\times10^4$ Wm^–2 falls on a perfectly reflecting surface at normal incidence. If the surface area is $15$ cm², the average force exerted on the surface is:
1. $1.25\times 10^{-6}$ N
2. $2.50\times 10^{-6}$ N
3. $1.20\times 10^{-6}$ N
4. $3.0\times 10^{-6}$ N

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is:

The ratio of the amplitude of a magnetic field to the amplitude of an electric field for an electromagnetic wave propagating in a vacuum is equal to:

The electric and the magnetic fields, associated with an electromagnetic wave, propagating along the positive Z-axis, can be represented by:
1. $\left [E=E_{0}\hat{k},~B=B_{0}\hat{i} \right ]$
2. $\left [E=E_{0}\hat{j},~B=B_{0}\hat{j} \right ]$
3. $\left [E=E_{0}\hat{j},~B=B_{0}\hat{k} \right ]$
4. $\left [E=E_{0}\hat{i},~B=B_{0}\hat{j} \right ]$

Which of the following statement is false for the properties of electromagnetic waves?