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Unit 9 · People, Development and Environment Paper 1 · 13 October 2022 Evening

Reducing the intensity of noise by a factor of 10 will mean a reduction in noise level byध्वनि की तीव्रता को 10 के गुणक से कम करने पर शोर स्तर में कितनी कमी होगी?

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Correct answer: A. 10 dB

Explanation

The decibel scale is logarithmic: noise level = 10 log₁₀ (I/I₀). If the intensity I becomes I/10, the level changes by 10 log₁₀ (1/10) = 10 × (−1) = −10. Hence the noise level falls by 10 dB.डेसिबल मापक्रम लघुगणकीय है: शोर स्तर = 10 log₁₀ (I/I₀)। यदि तीव्रता I घटकर I/10 हो जाए, तो स्तर में परिवर्तन = 10 log₁₀ (1/10) = 10 × (−1) = −10। अतः शोर स्तर 10 dB घट जाएगा।

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