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Question

Find the correct option among the following -
[ a absorptive power, r reflective power, t transmissive power ]


A
a+r+t=0
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B
a+r+t=1
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C
a+t=r
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D
a+r=t
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Solution

The correct option is B a+r+t=1
We know that, radiant energy per unit area per unit time(Q),
Qincident=Qabsorbed+Qreflected+Qtransmitted
Qi=Qa+Qr+Qt
1=QaQi+QrQi+QtQi
a=QaQi=absorptive power  
r=QrQi=reflective power  
t=QtQi=transmissive power 

a+r+t=1

Physics

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