Because of barriers and obstructions, you can see only a tiny fraction of a standing wave on a string. You do not know, for instance, how long the string is. All you know is that the speed of waves on the string is 100 m/s and that the distance is 10 cm. Can you determine the frequency of the standing wave? 1. Sure, the frequency is 1000 Hz. 2. Sure, the frequency is 500 Hz.
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