the goal:

To study the relationship between the pitch of a sound and its source frequency.

Materials and tools:

Large size book - rubber band - two pens

Steps:

1- Tie a rubber band around the book and place the two pens under the tape near the ends of the book

2- Press the index finger of the left hand on the tape at a small distance from one of the two pens, then move this part of the tape with the index finger of the right hand

3- Repeat the previous step a few more times, changing the length of the vibrating part of the band each time

Note:

The sound pitch changes as the length of the vibrating segment changes, where.

-The sound becomes more sharper as the length of the string decreases 

-The sound becomes more harsher as the length of the string increases.

The number of vibrations produced in one second (frequency) decreases by increasing the length of the string

Conclusion:

The sound pitch is a property of sound by which the car can distinguish between harsh and sharp voices.

-The sound pitch depends on the frequency of the sound source.

-The sound pitch increases by increasing the frequency and vice versa.

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