Camara Design

Microphone 3.3: Mechanical Telephone

My project

The goal for my project was to build a machine that vibrates when i speak, so i made a mechanical telephone. The materials that I used to make my telephone were 2 plastic cups and fishing wire. The two ends of the telephones were 3 meters apart. The telephone did not need any electricity for it to work. To test out if the telephone worked my partner whispered into one end of the plastic cup saying “Hello” and it sounded loud and clear, I was surprised because he just whispered!

Data

When it was my turn to speak into the plastic cup I held the cup in front of my face and started talking and while I was talking and holding the cup I felt the cup vibrating.

Claim

A scientific claim that I can make based on my data is that as I was speaking into the plastic cup I felt the cup vibrating on my hand when I was holding it.

Significant

My telephone exploits the fact that I can convert sound to vibration and vibration to sound. The sound from my voice affected the cup that I spoked into by vibrating, same thing with the string and the second cup. The reason the second cup produced sound for the listener was because as I was speaking into it I was making the cup vibrate.

Headphones 1.3: Sound Lab Report

Questions

The first scientific question I am investigating is, How is sound made?

The second scientific question I am investigating is, What determines the pitch of a sound?

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 string on the Ukulele also vibrated when played.

The singers vocal cords vibrated when she sang.

The large tuning fork sounded low.

The small tuning fork sounded high.

The drum vibrated when hit.

The cymbals vibrated when hit too.

Analysis

All of the instruments vibrated when making sound.

The smaller tuning fork vibrated 2 times faster than the large tuning fork. We saw this on the scratches on the aluminum fol.

Claims

Sound is caused by vibration.

The speed of vibration determines the pitch.

Reasoning

My research suggests the 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 then 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.