Echoes by Sylvia

If you talk into a room with carpet it won't vibrate because it absorbs the sound. But if you talk in to a cave or tunnel the walls are hard so the sound vibrates so it has nowhere to go. So it bounces off the wall and echoes but gradually the sound gets smaller. And that is how echo works.

Purerehua From Cairo

What is a  purerehua?
A purerehua is a maori instrument.Sometimes it is played to welcome a new day or a new born baby.
How does it make sound?
A purerehua is a type of wood shaped like a surfboard tied to a string. When you swing it, it pushes the air particles out of its way. When it is going round and round it pushes the air  particles and it makes sound, which  makes the vibrations.

Whisper Dishes By Maya

When we went to the Faraday centre we had  been learning about sound. When we had finished in the first room we went to the second room. Our group had been doing the whisper dishes. It was cool and I was on one side and sylvia was on the on the other side. I think how the whisper dishes work is your voice goes in the circle and rebounds back to the other one.

Telephones by Hine and Alex

How do string telephones work and how do they relate to olden day telephones?

We did this experiment to see how our voice turned into vibrations.
The string has to be straight so the vibrations can travel through the string, and if the string isn’t straight or someone’s touching it, will absorb the vibrations. And if it’s around a corner it still want work.

We decided to have a four-way conversation to see if it worked. We tried to wrap one string around the middle of the other string. It didn’t work because it cut all the other vibrations off to the other people.

After a while we softly put one string gently on top of the other, so it touched a little too. So the vibrations could go in every direction, so the others could hear.

So we found out that four-way conversations could work. We want to find out if six-conversations could work too.

Olden/Modern day telephones.

Olden telephones work different to modern day telephones. Olden day telephones have changed past a century, you used to move the big dialling circle to make a call. Olden day telephones take up more space than modern telephones.

Olden/Modern telephones transmit your voice as vibrations into the other persons telephone, but it’s not actually your voice that has ended up on the other telephone. Your vibrations travels through the wires and changes your voice.

Modern telephones are slimmer and have improved the age of the shape of olden day telephones. Now the modern telephones have changed not having an antenna on top of it, to get a signal.

So now you know how, Olden day telephones and modern telephones compare against each other.

How do you play bottle music and how does it work?

You have to have a bottle to play the music. You blow on top of the bottle so it makes a sound and it makes a huge vibration that bounces off the glass and comes out the top.

Some people in our class decided to fill bottles up with different amounts of water to make different pitch’s.
We used some metal strikers to hit the bottles and jars to make a tune even a rhythm.

Some people changed the amounts of water for the pitch to work and it was fun at the same time.

By Hine and Alex

Record player by Michelle

Record players were made in the olden days but these days we have DVD players. DVD players can show videos and sound but record players can only play sound.How does sound work on a record player?

The record player is a rectangular prism and there is a record in the record player. The bumps in the grooves are like a gravel road so when the needle hits the bumps the needle vibrates then the vibrations travel up the needle into the horn then the horn amplifies the vibrations so then we can hear sound.

So now you know how a record player makes sound.