1.

{:(,"Column A",,, "Column B"),(A., "Amplitude", (), a., "Vocal cords"),(B., "Frequency", ( ), b., "Sound absorbing material."),(C., "Human beings", ( ), c., "Reciprocal of time period"),(D., "Carpets", ( ), d., "m"):}

Answer»


ANSWER :A : DB : CC : AD : B


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