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7La - Making sounds
AB
male grasshopperschirp
gorillasthump
humans havevocal cords
sounds are made byvibrations
sound is usedto communicate
Bats use soundto locate their prey
stags roarto keep other mates away
high intensity =high volume
a high notehas a high pitch
number of vibrations per second= frequency
units of frequencyhertz
the size of a vibration =amplitude
a high note hasa high frequency
a loud noise hasa high amplitude


Miss Garner

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