Question
Question: The ratio of intensities between two coherent sound sources is 4 : 1. The difference of loudness in ...
The ratio of intensities between two coherent sound sources is 4 : 1. The difference of loudness in decibels (dB) between maximum and minimum intensities, when they interfere in space is –
A
10 log 2
B
20 log 3
C
10 log 3
D
20 log 2
Answer
20 log 3
Explanation
Solution
=14, 
= 9
L = 10 log 
where I0 ® Threshold intensity
L1 – L2 = 10 log = 
= 20 log 3