NEET Physics Question - Thermal Physics - Heat Transfer

Assertion (A): A body is emitting primarily red light. As the temperature of body is increased it may emit primarily yellow light.

Reason (R): Rate of radiation emitted by a body increases as the temperature increases.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

Assertion (A) is true based on Wien's Displacement Law \( (\lambda_{\text{max}} T = b) \), where increasing ( T ) shifts \( \lambda_{\text{max}} \) to shorter wavelengths (red to yellow). Reason (R) is true based on Stefan-Boltzmann law \( (P \propto T^4) \). However, (R) explains the total radiated power, not the peak wavelength shift, so it's not the correct explanation for (A). Both are true, but (R) does not explain (A).

Rankers Physics

Body Temperature and Radiation Emission

Solution:

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