Question

If 40 calories are incident on a body of absorption coefficient 0.45, the energy rejected by the body is

• A. 40 cal
• B. 18 cal
• C. 45 cal
• D. 22 cal

Answer 1

Answer: (D)

22 cal

If the absorptive power is 0.45 this means that the body absorbs 45% of all incident radiation on it and rejects 55%.
If 40 cal of radiation is incident on it, it will reject 55% of it; which is 22 cal.