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Answered

1. Sounds are caused by reflection of objects
2. When we talk, our mouth vibrates to mak
Frequency is how high or low a sound is
The pitch of a sound depends on the ener
The frequency of a sound wave is the nun​

Sagot :

GUEVARRAALLYSAIN

Answer:

 1.Sounds are created because of vibration

2.TRUE

3.TRUE                                                                                                                                                                      

Explanation:

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