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CUET
Physics
Electromagnetic Waves
If 150 J of energy is incident on area 2 m2. If Qr = 15 J, coefficient of absorption is 0.6, then amount of energy transmitted is |
50 J 45 J 40 J 30 J |
45 J |
When thermal radiations (Q) fall on a body, they are partly reflected, partly absorbed and partly transmitted. Q=Qa+Qr+Qt And QaQ+QrQ+QtQ=a+r+t=1 ⇒15150+0.6+x=1 or 0.1+0.6+x=1 or x=0.3 Transmitting power, t=QtQ or 0.3=Qt150 ⇒ Qt=45J |