Question

prove a + r + t = 1​

Answer 1

Explanation:

• a + r + t =1  (usual meaning)
• Thermal radiations ⇒ falls⇒ objects
• some heat energy ⇒ reflected, absorbed ,transmitted
• Qa, Qr, Qt are heat absorbed, reflected, transmitted
• Law of conservation of energy, Q = Qa + Qr + Qt (Q is total amount of thermal energy)
• Divide by Q,
• Q/Q = Qa/Q =Qr/Q =Qt/Q
• Therefore, a + r+ t = 1.