Grade 8 Sound Worksheets - WorkSheets Buddy 2. The sound from a mosquito is produced when it vibrates its wings at the average rate of 500 vibrations per second. What is the time period of the vibration? 3. Identify the part which vibrates to produce sound in the following instruments: (a) Dholak (b) Sitar (c) Flute 4. What is the difference between noise and music? Can music become ...