Assertion : Microwaves are heat waves which is used to heat up food in ovens.
Reason : In ovens, microwaves heat up the vessel first and food inside gets heated up by the transfer of energy from the vessel.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Answer

D

Explanation

Mecrowaves are not heat waves. Microwaves have frequency and energy smaller than visible light and wavelengths larger than it. In microwave ovens, the frequency of the microwaves is selected to match the resonant frequency of water molecules so that energy from the wave is transferred efficiently to the kinetic energy of the molecules. This raises the temperature of any food containing water.