Electromagnetic Waves Ques 15
15. 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.
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Answer:
Correct Answer: 15.(d)
Solution:
- (d) Required condition: Frequency of microwaves $=$ Resonant frequency of water molecules.
BETA
