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To hear a distinct echo, the minimum distance between the source of sound and the reflecting surface must be:a)10 metersb)17.2 metersc)34.4 metersd)50 metersCorrect answer is option 'B'. Can you explain this answer? for Class 9 2026 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about To hear a distinct echo, the minimum distance between the source of sound and the reflecting surface must be:a)10 metersb)17.2 metersc)34.4 metersd)50 metersCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 9 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for To hear a distinct echo, the minimum distance between the source of sound and the reflecting surface must be:a)10 metersb)17.2 metersc)34.4 metersd)50 metersCorrect answer is option 'B'. Can you explain this answer?.

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