"if you stretch a rubber band and pluck it, you hear a" (somewhat) musical tone. how does the frequency of this tone change as you stretch the rubber band further?

The frequency of the tone becomes higher

Explanation

Sound is produced when there is vibration.  

When a rubber band is stretched and plucked, a vibration is produced, in turn producing a sound of a certain frequency.

When the rubber band is further stretched however, the force is increased, the vibration becomes stronger, increasing the frequency of the sound produced. The sound produced therefore has a higher pitch and is louder.

answer; observing;

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