MHT-CET : Physics Entrance Exam

### MHT - CET : Physics - Radiation Formulae Page 1

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1. a + r + t = 1

 where a = coefficient of absorption r = coefficient of reflection t = coefficient of transmission

2. Stefan's Law of Radiation

Q = s A t T4 for a black body
Q' = e s A t T4 for any other body

 where, Q = amount of heat radiated A = area of surface of the body   T = Temperature in K s = Stefan's constant t = time e = emissivity of the body

3. When a Body is Kept Inside a Constant Temperature Enclosure

 R = dQ = e s A (T4 - T04) dt

 where, dQ = rate of loss of heat dt T0 = temperature of enclosure in K

 4. For Any Body

 R = dQ µ T4 or R = dQ µ (T4 - T04) dt dt

 \ R1 = T14 or R1 = T14 - T04 R2 T24 R2 T24 - T04

5. Newton's Law of Cooling

 dQ µ (q - q0) dt

 dQ = ms dq dt dt

 dQ = K (q - q0) Þ dq µ (q - q0) dt ms dt

6. q1 q2 q3 (q1 > q2 > q3)

 \ dq = K (q - q0) dt

 q1 - q2 = K [ q1 + q2 - q0 ] t1 2

 q2 - q3 = K [ q2 + q3 - q0 ] t2 2

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