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Unit 9 · People, Development and Environment Paper 1 · 20 October 2022 Morning

A 20 dB increase in noise level represents an enhancement in intensity of sound by a factor ofशोर स्तर में 20 dB की वृद्धि ध्वनि की तीव्रता में कितने गुना वृद्धि दर्शाती है?

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Correct answer: C. 100

Explanation

Sound level in dB = 10 log10(I/I0). An increase of 20 dB means log10(I2/I1) = 2, so the intensity rises by 102 = 100 times.ध्वनि स्तर (dB) = 10 log10(I/I0)। 20 dB वृद्धि का अर्थ है log10(I2/I1) = 2, अतः तीव्रता 102 = 100 गुना बढ़ती है।

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