Transmission Of Heat Question 159
Question: Which of the following is the example of ideal black body
[AIEEE 2002; CBSE PMT 2002]
Options:
A) Kajal
B) Black board
C) A pin hole in a box
D) None of these
Show Answer
Answer:
Correct Answer: C
Solution:
When light incident on pin hole, enters into the box and suffers successive reflection at the inner wall. At each reflection some energy is absorbed. Hence the ray once it enters the box can never come out and pin hole acts like a perfect black body.
BETA
