Waves and sound(in dutch golven en trillingen)

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Sernav	Waves and sound(in dutch golven en trillingen)
Danasîn	Hi there For dutch viewers I made this youtube instruction on waves and sound using 4 phet annimations http://youtu.be/zU3WdZOPDws
Dem	30 xulek
Bersîvan Dihewîne	Erê
Ziman	Dutch
Peyvên Girîng	frequency, pendulum, period, sound, spring, waves
Şêwekar	Bariste & Kevan, Ezmûngeha Dardarokê, Dengvedan, Deng