Question

Out of 20 J of radiant energy incident on a surface, the energy absorbed by the surface is 4 J and the energy reflected is 8 J. Then, coefficient of transmission of the body is ____________.

Options

• 0.4

• 0.7

• 0. 1

• zero

Answer 1

Out of 20 J of radiant energy incident on a surface, the energy absorbed by the surface is 4 J and the energy reflected is 8 J. Then, coefficient of transmission of the body is 0.4.

Explanation:

Q = Q_a + Q_r + Q_t

`therefore 20 = 4 + 8 + "Q"_"t" Rightarrow "Q"_"t" = 8  "J"`

`therefore "Coefficient of transmission,"  "tr" = "Q"_"t"/"Q" = 8/20`

` = 0.4`