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Assertion : All bodies emit radiant en...

Assertion : All bodies emit radiant energy whether they are solid, liquid or gases.
Reason : Black bodies absorb and emit radiant energy better than bodies of lighter colours.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true and reason is not the correct explanation of assertion.

C

If assertion is true and reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we will analyze both the assertion and the reason provided in the statements. ### Step 1: Analyze the Assertion The assertion states that "All bodies emit radiant energy whether they are solid, liquid, or gases." - **Explanation**: This statement is true. According to the laws of thermodynamics, all objects with a temperature above absolute zero emit thermal radiation. This emission occurs regardless of the state of matter (solid, liquid, or gas). The amount and type of radiation emitted depend on the temperature and properties of the material. ### Step 2: Analyze the Reason The reason states that "Black bodies absorb and emit radiant energy better than bodies of lighter colors." - **Explanation**: This statement is also true. A black body is an idealized physical object that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. It is also the most efficient emitter of radiation. Bodies of lighter colors reflect more light and absorb less, making them less efficient at emitting radiant energy compared to black bodies. ### Step 3: Determine the Relationship Between Assertion and Reason Now we need to determine if the reason correctly explains the assertion. - **Explanation**: While both statements are true, the reason does not directly explain the assertion. The assertion is about the emission of radiant energy by all bodies, while the reason specifically discusses the properties of black bodies in comparison to lighter-colored bodies. The reason provides additional information but does not clarify why all bodies emit radiant energy. ### Conclusion Both the assertion and the reason are true, but the reason is not the correct explanation for the assertion. Therefore, the correct answer is that both statements are true, but the reason is not the explanation for the assertion. ### Final Answer - Assertion: True - Reason: True - Conclusion: Reason is not the correct explanation for the assertion.
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