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The coefficients of absorption and reflection of the surface of a thin plate are \( 0.74 \) and \( 0.22 \) respectively. If \( 184 cal \) of radiant heat is incident on the surface of the plate, find the quantities of heat (i) absorbed (ii) reflected (iii) transmitted. (4 marks) |
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Answer» Given, the coefficient at absorption a = 0.74 The coefficient at reflection = r = 0.22 We know that a + r +t = 1 Where a = absorption coefficient r = reflection coefficient t = transmit coefficient 0.74 + 0.22 + t = 1 t = 1 - 0.96 t = 0.04 i) Quantities of heat absorption Qa = a x Q Qa = 0.74 x 184 Qa = 136.16 cal ii) Quantities of heat reflection Qr = r x Q Qr = 0.22 x 184 Qr = 40.08 cal iii) Quantities of heat transmitted Qt = t x Q = 0.04 x 184 Qt = 7.36 cal |
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