A candidate for a student
government office records her campaign
speech, but when she hears the recording,
her voice is squeaky and nasal. She and her
friends consult Rollo, the local science
whiz. He shows them voiceprints on his
computer, helps them compare her live
speech with the distorted recording, and
then adjusts the recording until it is more
like her real speech. He also demonstrates
how a violin string creates sound and how
sound waves are not transmitted in a vacuum.
The students use a camcorder and
microphone to record different sounds and
study their soundprints. They discuss the
difference between the speeds of light and
sound and the Doppler effect.

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