Question

Given that 'p' joule of heat is incident on a body and out of it 'q' joule is reflected and transmitted by it. The absorption coefficient of the body is ____________.

Options

• p/q

• q/p

• (q - p)/p

• (p - q)/p

Answer 1

Given that 'p' joule of heat is incident on a body and out of it 'q' joule is reflected and transmitted by it. The absorption coefficient of the body is (p - q)/p.

Explanation:

 Q = p        .... [Given]

∴ Q_r+Q_t=q

Let, Q = Q_a + Q_r + Q_t

∴ p = Q_a + q or Q_a = p - q

∴ Coefficient of absorption, a = `Q_a/Q` = `(p-q)/p`