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In this applet two waves of equal amplitude are interfering. You can control the centre or nominal frequency of the waves and also introduce a small frequency difference between them. When you have set these two controls, click on the centre panel and the computer will draw out the wave.
This would be better with a time domain, so you could see that a 3 Hz difference in the two tones creates 3 beats per second.
5 years ago
URL is no good
URL is no good.
6 years ago
Seems to have disappeared.
13 years ago
Good display of the effects of interference and frequency differences and their relevance to the real world (such as in tuning musical instruments). The explanation is helpful, and there are tips on what to watch while playing with the applet
Needed to manually update changes to the frequencies of the waves, which is nice in that it doesn't eat up memory like other applets.