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I just got a plasma ball and it effects my digital clock radio. Is this because of IR waves or something else that the ball is giving off?
- Bijan (age 9)
It's probably emitting radio-frequency waves (as well as other
frequencies, like the visible light you can see). Electrical sparks
have broad frequency spectra. Put your radio next to a running car
engine and tune it on the AM dial between stations and you'll doubtless
hear the spark plugs clicking periodically. I was even able to pick up
the radio noise my pocket calculator emitted on an AM radio when I put
the calculator right next to the radio's antenna and tuned it between
stations on the AM dial.
(republished on 08/02/06)
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