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प्रश्न
Mention one important condition is necessary for an echo to be heard distinctly.
लघु उत्तर
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उत्तर
For a distinct echo, the reflected sound must reach the ear at least 0.1 s after the original sound. In air, this generally requires the reflecting surface to be about 17 m or more away.
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 3: Sound - Frequently Asked Questions in Board Examination [पृष्ठ २०८]
