Question

. The background noise level in an area is represented by which of the following noise indices?

(A) L10

(B) L50

(C) L90

(D) TNI
. The chemical formula for CFC-11 is

(A) CF2Cl2

(B) CFCl3

(C) CHFCl2

(D) CHCl3
Answer these two questions ​

Answer 1

Answer:

1. The background noise level in an area is represented by which of the following noise indices

B) L50

Explanation:

The chemical formula for CFC-11 is

(B) CFCl3

hence this is your answer dear. please mark me brainliest

Answer 2

Answer:

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