Sound

1. without sound, there won't be music :>

2. Characteristics of Sound (Reg 1-5)

2.1. New node

3. Applications of Sound (Reg 6-10)

4. What is Sound? (Reg 11-15)

4.1. New node

4.1.1. New node

5. music!

6. testing

7. Production of Sound (Reg 16-20)

7.1. New node

7.2. New node

7.3. New node

8. Transmission of Sound (Reg 21-25)

8.1. Reflection

8.2. New node

9. Detection of Sound (Reg 26-30)

9.1. Function of Ear

9.2. New node

10. Speed of Sound (Reg 31-33)

11. Loudness and Pitch (Reg 11-15)

12. dsgdgdf

13. sfsgskjsgklfs