1. ശബ്ദത്തിന്‍റെ ത്രീവത അളക്കുന്ന ഉപകരണം [Shabdatthin‍re threevatha alakkunna upakaranam]

Answer: ഓഡിയോ മീറ്റര്‍ [Odiyo meettar‍]
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