Headphones 1.3: Sound Lab Report

Questions

1. The first scientific question I am investigating is “How is sound made?”
2. The second scientific question I am investigating is “What determines the pitch of a Sound?”

Claims

Sound is caused by vibration.

The speed of vibration determines the pitch.

Data/Evidence

• The Tuning Forks vibrated.
• When you stopped the vibration, the tuning forks stopped making sound.
• The string on the violin vibrated when played.
• The strings on the ukulele vibrated when played.
• The singer’s vocal cord vibrated when she sang.
• The large tuning fork sounded low.
• The large tuning fork vibrated 4 times.
• The small tuning fork vibrated 8 times.
• The drum vibrated when hit.
• The cymbals vibrated.

Analysis

1. All of the instruments vibrated when making sound.
2. The smaller tuning fork vibrated 2 times faster than the large tuning fork. We saw the scratches on the aluminum foil.

Reasoning

My research suggests that sound is caused by vibration because every instrument vibrated when making sound.

My research suggests that pitch is determined by the speed of vibration because the small tuning fork vibrated two times faster than the large tuning fork and sounded higher.

Significance

This means if I want to build a machine that can make any sound, it must be able to vibrate at any speed.