Experiment of standing wave in the spring
Preparation thing: spring, long desk
Persons: two people
Procedure：1.I'll leave about 3m Grip the sides with two people the spring.
2.Move left and right to the spring, both of whom makes a wave.
(Video below is the standing wave from the second half.)
3.Measure the time it takes for the waves to 10 standing wave vibration
is Kitara can.
Result：It was 2,3 (s) the average time it took for 10 round-trip.
Therefore,λ=3m×(2/3)=2m
Frequency f=10 times/2.3s≒4.34Hz
Wave speedv=fλ=4.34Hz×2m=8.68m/s
Became.
＊Voice flows through the video below, please note the volume.