The front row of a concert has a sound level of 120 dB and an IPod produces 100 dB. How many IPods would be needed to produce the same intensity as the front row of the concert?
Originally it was the
The levels above could well have been called
So now, ten times the sound means adding
Going from 100 to 120 equals 2 steps of ten.
These are equivalent to 2 times multiplying by 10.
Answer : you will need