During a test, sound level was measured as 90 dB in the operator's cabin on a t

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During a test, sound level was measured as 90 dB in the operator's cabin on a tractor. Taking reference sound pressure as 2 * 10-5 N m-2, the measured RMS sound pressure in N m-2 is

Options:

A . 6.32

B . 6.32 * 10-1

C . 1.8 * 10-3

D . 6.32 * 10-10

Answer: Option B

-NA-

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