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Infrasonic waves have frequenciea)below 20 Hzb)between 20 Hz and 20,000 Hzc)above 20,000 Hzd)noupper or lower limit of frequenciesCorrect answer is option 'A'. 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 Infrasonic waves have frequenciea)below 20 Hzb)between 20 Hz and 20,000 Hzc)above 20,000 Hzd)noupper or lower limit of frequenciesCorrect answer is option 'A'. 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 Infrasonic waves have frequenciea)below 20 Hzb)between 20 Hz and 20,000 Hzc)above 20,000 Hzd)noupper or lower limit of frequenciesCorrect answer is option 'A'. Can you explain this answer?.

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