Asource of sound is kept in a jar in a vacuum. air is slowly introduced in to the jar. what happens to the sound coming out of the jar? a the loudness of the sound increases gradually. b the loudness of the source decreases gradually. c the sound remains unchanged. d the pitch of the sound increases gradually. e the pitch of the sound decreases gradually.
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Asource of sound is kept in a jar in a vacuum. air is slowly introduced in to the jar. what happens...
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