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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

  T4 or R =  

dQ

  (T4 - T04)

dt

dt

 

R1

 = 

T14

 or 

R1

 = 

T14 - T04

R2

T24

R2

T24 - T04

 

5. Newton's Law of Cooling

 

dQ

  (q - q0)  

dt

 

dQ

 = ms  

dq

dt

dt

 

 

dQ

 = 

K

 (q - q0)  

dq

  (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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