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Question

The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

इकाई सतह क्षेत्र से इकाई ठोस कोण के माध्यम से सतह के अभिलम्ब के साथ ऊर्जा उत्सर्जन की दर को क्या कहते हैं?

A.

Emissivity

B.

Transmissivity

C.

Reflexivity

D.

Intensity of radiation

Answer ( Option D)

Intensity of radiation

Solution

The intensity of radiation is defined as the rate of emission in a given direction from a surface per unit solid angle and per unit projected area of a radiating surface on a plane perpendicular to the direction of radiation.

Hence, the correct option is (D).

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