Question
Question: A line source emits a cylindrical wave. If the medium absorbs no energy, the amplitude will vary wit...
A line source emits a cylindrical wave. If the medium absorbs no energy, the amplitude will vary with distance r from the source as proportional to
A
r−1
B
r−2
C
r−1/2
D
r1/2
Answer
r−1/2
Explanation
Solution
The energy is inversely proportional to the square of distance. Hence the amplitude is inversely proportional to the distance.