Assertion : Like light radiation, thermal radiations are also electromagnetic radiation.
Reason : Thermal radiation require no medium for propagation.

Both assertion and reason are true and reason in the correct explanation of assertion.

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Both assertion and reason are true but reason is not the correct explanation of assertion.

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Assertion is true but reason is false.

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Both assertion and reason are false.

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Solution

The correct option is D Both assertion and reason are true but reason is not the correct explanation of assertion.
Thermal radiations are infrared waves. They have wavelengths more that the visible rays because all the waves in infrared zone have the wavelength more than that of visible light.
Since thermal radiation are infrared waves, they follow that properties of light. So, they can propagate through vacuum.
Now, assertion and reason are both correct, but reason does not explain assertion.

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Assertion : Like light radiation, thermal radiations are also electromagnetic radiation.Reason : Thermal radiation require no medium for propagation.

Assertion : Like light radiation, thermal radiations are also electromagnetic radiation.
Reason : Thermal radiation require no medium for propagation.