Today , we watched the physic film .Mr "same same " (i dont know his name ^^) ..teached us about the sound.In the film,we saw when we knock one of 2 tuning forks which faced to each others, the one which was not knocked also vibrate because of the resonance,and the other things are the tuning fork vibrate and created air pressure ect.... and the end of the class,Ms. Kozoriz showed us the voice of the big woman which can broke a glass >.< ,and the answer of the Exercises:3-4-5-7, you can check them if you missed today 's class...
3/ Dog can hear frequencies in ultrasonic region,you can't
4/ a.Change amplitude
b. change frequency
5/Vibration of sound caused energy to trigger the avalanche
7/ A medium is needed
Next scribe is kissy
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