NEET Physics Question - Thermal Physics - Heat Transfer

Assertion (A): A body with large reflectivity is a poor emitter of heat radiations.

Reason (R): A body with large reflectivity is a poor absorber of heat.

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:

Kirchhoff's law states that a good absorber is also a good emitter. A body with large reflectivity (R) is a poor absorber (A), since A = 1 - R (assuming no transmission). Therefore, a poor absorber is a poor emitter. Both Assertion (A) and Reason (R) are true, and (R) correctly explains (A).

Rankers Physics

Reflectivity and Emissivity

Solution:

Leave a Reply Cancel reply