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a sound pressure level of 40 decibels is equivalen
Question:
A sound pressure level of 40 decibels is equivalent to a sound pressure of:
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Decibels measure sound intensity on a logarithmic scale, relative to a reference pressure (P0 = 2 × 10−5 Pa).
CUET (PG) - 2024
CUET (PG)
Updated On:
Jan 7, 2025
0.002 Pa
0.04 Pa
20 Pa
40 Pa
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The Correct Option is
A
Solution and Explanation
The sound pressure level in decibels is given by:
\( L_p = 20 \log_{10} \left( \frac{P}{P_0} \right) \)
Substituting \( L_p = 40 \, \text{dB}, \, P_0 = 2 \times 10^{-5} \, \text{Pa} \), we get \( P = 0.002 \, \text{Pa} \).
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