The cumulative noise power distribution curve at a certain

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The cumulative noise power distribution curve at a certain location is given below:

The value of L₄₀ is equal to

1. 90 dBA
2. 80 dBA
3. 70 dBA
4. 60 dBA

Correct Option: C

L₄₀ – the noise level which is exceeded 40% of time.

Slope of line =	100 - 0	= 2
	100 - 50

To find L₄₀,

2 =	40 - 0
	L₄₀ - 50

∴ L₄₀ = 70 dB.