150 J of energy is incident on area 2 m 2 . If Q r = 15 J , coefficient of absorption is 0 . 6 , then the amount of energy transmitted is

Question

150 J of energy is incident on area 2 m 2 . If Q r = 15 J , coefficient of absorption is 0 . 6 , then the amount of energy transmitted is, 50 J, 45 J, 40 J, 30 J

MARKS App · Accepted Answer

When thermal radiations ( Q ) fall on a body, they are partly reflected, partly absorbed and partly transmitted. Q = Q a + Q r + Q t And Q a Q + Q r Q + Q t Q = a + r + t = 1 ⇒ 15 150 + 0.6 + x = 1 or 0.1 + 0.6 + x = 1 or x = 0.3 Transmitting power, t = Q t Q Or 0.3 = Q t 150 ⇒ Q t = 45 J

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