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Sound — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceSound1 Mark
Question
Perforated card boards are used in halls, for:
✓

Answer

  1. Absorption of sound
Explanation:
Perforated cardboard gypsum boards are an economical and efficient option to incorporate into projects, absorbing the sound and reducing the noise level generated by the reverberation through different patterns and shapes.

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