Question

Q6. What emissive power?
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Answer 1

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• Emissive power of a body at a particular temperature is the total amount of thermal energy emitted per unit time per unit area of the body for all possible wavelengths.

• It is denoted by eλ .

• Its SI unit is 'joule sec-l metre-2 or 'watt-metre-2'.

• Its dimensional formula is [MT-3].

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Answer 2

Explanation:

Emittance (or emissive power) is the total amount of thermal energy emitted per unit area per unit time for all possible wavelengths. ... The energy emitted at shorter wavelengths increases more rapidly with temperature.

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