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http://new.photos.yahoo.com/dendweller143/album/576460762319255761#page1

2006-10-05 23:51:50 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Other - Science

2 answers

The diagram shows how light focused on a mirror can transmit sound vibrations of a speaker wirelessly across a room where the light energizes an electrical transducer to convert the light waves into current to drive earphones allowing the listener to hear the original message.

2006-10-06 00:21:47 · answer #1 · answered by Kes 7 · 0⤊ 0⤋

this is mechanical instrument because it have battery and some wire who connect one point to another it can be phone or tally gram machine

2006-10-06 07:10:48 · answer #2 · answered by thakur4u5 2 · 0⤊ 0⤋