Question

The intensity of sound at a calm place should be.a.50db.....b.....60db.......c........30db..........d...........40db....who is the correct option. .

Answer 1

from your option it should be (c) 30db
aa per calm place.. it is silence.... no loudness two it can be less than 20 db too

Hope it helps
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Answer 2

Answer:

The correct answer of this question is option C ,30db.

Explanation:

The human ears can hear the sounds between 20MHz-20000MHz. The sounds below this range are partially or completely non audible by normal human ears.

And similarly,the 30db sounds belong to the lowermost area of this audible sound range.

That's why the calm place's sounds should be similar to 30db.