Alarm Clock Inside A Bell Jar
by Science Photo Library
Title
Alarm Clock Inside A Bell Jar
Artist
Science Photo Library
Medium
Photograph - Photograph
Description
Alarm clock inside a bell jar. This illustrates an experiment to show that sound requires air for propagation. The alarm clock is allowed to ring while the air is evacuated from the bell jar. The ringing noise gets quieter until a vacuum is achieved, when it is silent even though the mechanism is working.
Uploaded
June 29th, 2016
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