The condition under which a microwave oven heats up a food item containing water molecules most efficiently is
- AThe frequency of the microwaves has no relation with the natural frequency of water molecules.
- BMicrowaves are heat waves,so they always produce heating.
- CInfra-red waves produce heating in a microwave oven.
- DThe frequency of the microwaves must match the resonant frequency of the water molecules.
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Similar Questions
$A$ plane electromagnetic wave of frequency $500\, MHz$ is travelling in vacuum along $y$-direction. At a particular point in space and time,$\overrightarrow{B} = 8.0 \times 10^{-8} \hat{z}\, T$. The value of electric field at this point is (speed of light $c = 3 \times 10^{8}\, m/s$). $\hat{x}, \hat{y}, \hat{z}$ are unit vectors along $x, y$ and $z$ directions.
Assertion $(A)$: Electromagnetic waves exert pressure,called radiation pressure.
Reason $(R)$: This is because they carry energy.
Reason $(R)$: This is because they carry energy.
Which of the following do not require a medium for transmission?
Easy
View Solution$A$ radio transmitter transmits at $830 \, kHz$. At a certain distance from the transmitter,the magnetic field has an amplitude of $4.82 \times 10^{-11} \, T$. The electric field and the wavelength are respectively:
MediumAIEEE 2012
View SolutionGiven below are two statements: one is labelled as Assertion $(A)$ and other is labelled as Reason $(R).$
Assertion $(A):$ Electromagnetic waves carry energy but not momentum.
Reason $(R):$ Mass of a photon is zero.
In the light of the above statements,choose the most appropriate answer from the options given below:
Assertion $(A):$ Electromagnetic waves carry energy but not momentum.
Reason $(R):$ Mass of a photon is zero.
In the light of the above statements,choose the most appropriate answer from the options given below:
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