AL GCE Portfolio: The Different Sound Of Instruments.

In the Junior STEAM course Light, Sound and Time, In our second unit “Sound” We appreciated the absence of sound and we discovered what makes up sounds; we talked about the spectrum of sounds and more.In the external portion of ‘Sound” we found out how radios use electromagnetic waves to transmit waves.

For this action project we made Diddley Bows, which is basically a guitar we made out of wood and three screws and a piece of guitar string and a tin can. First you make a hole in the back of the tin can, put a screw at the end on the piece of wood over the tip of the tin can and make sure that there is at least an inch of space for another screw at the open end of the tin can where the space is. Next you put the guitar string through the hole in the can (make sure it’s long enough to be a few inches from the end of the wood). Then put a screw at the end of the wood and make sure not to screw it all the way down so that you can rap the guitar string around the screw and make it tight. And that's how you make the “Guitar”. I am most proud of my guitar because it was the hardest part of this project, we had to wrap guitar wire around a screw which was very difficult.
The thickness of the string is 1.3mm and the length is 10cm.

Calculations. My diagrams explain the vibration, frequencies and wavelengths of my Diddley Bow. The Frequency is the number of complete cycles per second, in the case it is vibrations per second, and is measured in hertz. Wavelength is the distance from one peak to the next and can be thought of as one complete wave length.