Question
Question: How many times more intense is 90 dB sound than 40 dB sound ?...
How many times more intense is 90 dB sound than 40 dB sound ?
A
5
B
50
C
500
D
105
Answer
105
Explanation
Solution
40 = 10 log 
…(1)
90 = 10 log 
…(2)
90 – 40 = 10 log n , 