Question

If coefficient of emission is ‘e’ for a perfectly black body and coefficient of transmission is ‘t’ then, ______.

Options

• e = 0, t = 1

•  e = 1, t = 1

• e = 0, t = 0 

• e = 1, t = 0

Answer 1

If coefficient of emission is ‘e’ for a perfectly black body and coefficient of transmission is ‘t’ then, e = 1, t = 0.

Explanation:

For a perfectly black body:

• The coefficient of emission (e) = 1, meaning it absorbs and emits all incident radiation.
• The coefficient of transmission (t) = 0, meaning no radiation passes through it.

From the equation:

e + r + t = 1

Since a black body does not reflect radiation, r = 0, so:

1 + t = 1

t = 0