Question 7
(a) What is a perfect blackbody?
(b) Give one practical example of a blackbody.
Observation
The expected response:
(a) Definition of a perfect blackbody
A body that absorbs all incident radiations falling on it without reflecting or transmitting any.
OR
A body that absorbs completely radiations of all wavelengths falling on it.
(b) Practical examples of a blackbody
- A tiny deep hole (inside a cavity)
- The sun
- The earth.