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Why does a transistor radio wrap in foil get quiet?
Question Date: 2007-11-27
Answer 1:

A transistor radio functions by receiving a radio signal, amplifying that signal and sending it to a speaker.

Since the sound you hear depends on the amplified signal, if the signal is initially weak, the sound from the speaker will be weak.

If you surround the radio in metal (Al foil) you are weakening the signal received by the radio, and thus the radio output is also weakened.

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