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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The magnetic field of an electromagnetic wave is given by $B_y = 3 \times 10^{-7} \sin(10^3 x + 3 \times 10^{11} t)$,where $x$ is in meters and $t$ is in seconds. The wavelength of the electromagnetic wave is: (in $cm$)
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View SolutionIf the magnetic field of a plane electromagnetic wave is given by (The speed of light $c = 3 \times 10^8 \, m/s$):
$B = 100 \times 10^{-6} \sin \left[ 2\pi \times 2 \times 10^{15} \left( t - \frac{x}{c} \right) \right]$
Then the maximum electric field associated with it is:
$B = 100 \times 10^{-6} \sin \left[ 2\pi \times 2 \times 10^{15} \left( t - \frac{x}{c} \right) \right]$
Then the maximum electric field associated with it is:
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