Question

Heat is incident on a body at the rate of 300 calories/ minute. Out of this it absorbs 2 calories/second. Then its coefficient of absorption is

• A. 0.2
• B. 0.4
• C. 0.5
• D. 0.6

Answer 1

The correct option is B 0.4

Coefficient of absorption$=\frac{Heatabsorbedbybody}{Heatincidentbybody}$

$Q_{incident}=300$ cal/min

$=\frac{300}{60}$ cal/sec

$\Rightarrow 5$cal/sec

$Q_{absorbed}=2$ cal/sec

$\Rightarrow$ Coefficeint of absorption$=\frac{2}{5}$

$\Rightarrow 0.4$

$=0.4$.