Electromagnetic Waves - Result Question 22
22. The condition under which a microwave oven heats up a food item containing water molecules most efficiently is
[2013]
(a) the frequency of the microwaves has no relation with natural frequency of water molecules.
(b) microwaves are heat waves, so always produce heating.
(c) infra-red waves produce heating in a microwave oven.
(d) the frequency of the microwaves must match the resonant frequency of the water molecules.
Show Answer
Answer:
Correct Answer: 22. (d)
Solution:
- (d) Required condition: Frequency of microwaves $=$ Resonant frequency of water molecules.
