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STD 11 - 14. waves and sound — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 14. waves and sound4 Marks
Question
The intensity of sound wave while passing through an elastic medium falls down by $10\%$ as it covers one metre distance through the medium. If the initial intensity of the sound wave was $100$ decibels, its value after it has passed through $3$ metre thickness of the medium will be .... $decibel$
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Answer

(b) After passing the $3$ meter intensity is given by 

${I_3} = \frac{{90}}{{100}} \times \frac{{90}}{{100}} \times \frac{{90}}{{100}} \times I = 72.9\% \;{\rm{of }}I$ 

So, the intensity is $72.9$ decibel.

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