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Sound of the frequency below 20 Hz is known asa)Infrasonicb)Ultrasonicc)Echod)SonarCorrect answer is option 'A'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Sound of the frequency below 20 Hz is known asa)Infrasonicb)Ultrasonicc)Echod)SonarCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Sound of the frequency below 20 Hz is known asa)Infrasonicb)Ultrasonicc)Echod)SonarCorrect answer is option 'A'. Can you explain this answer?.

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