Cassidy And Terry Decibels around school

Standing Waves

After I found a good wave I took and picture of it then I calculated the speed which ended up being 17.02 m/s. To find the speed of the wave I multiplied the frequency of the wave which was 18.11Hz and the length of the wave which was .94 meters. In the end after multiplying the two I got to 17.02 m/s.

Standing waves photo Mara Stephen

We determined the speed of the wave on the string by using the speed=frequency times wavelength formula. We got the frequency to be 30.2 Hz and the wavelength to be 113 centimeters. We then converted 113 centimeters to be 1.13 meters. We multiplied 30.2 Hz by 1.13 meters to get 34.13 m/s to be the speed. We alos determined that there were 6 antinodes becasue there were 2.5 waves.

Standing Wave Photo Terry and Cassidy

Terry and Cassidy

We used the frequency generator and were able to make a standing wave and then we got the camera and took a snapshot of the standing wave. We measured the string which was 2.5 meters long. In our picture we had 6.5 waves. We divided 6.5meters by 2.5meters and got the wave length which was .38 meters for each wave. We then got the speed of the wave by multiplying
the frequency of the wave which was 72.9Hz and the wave length which was .38 meters long which gave us our speed of 27.7 m/s

Standing Waves Photo

After playing around with the frequency generator I was able to find some standing waves and then I took a picture of the standing wave with my phone . After taking the picture I was able to find the speed of the wave by multiplying the frequency of the wave which was 18.13Hz and the length of the wave which was .96 meters long. After multiplying the two I found out the speed which was 17.56m/s.

Decibel Levels Around The School

The decibel for the clock was 46.3 decibels.

The decibel for the fire alarm was 49.8 decibels.

The decibel for the light was 53.6 decibels.

The decibel reading for the tv was66.52 decibels.The decibel reading for the tree was 52.2 decibels.

A decibel is the unit used to meassure sound and the electrical signal that come from it. It also meassures loudness. You meassure deciebels by using a decibel meter to meassure the electrical signals and the sound that comes from an object. Each thing has their own decibel so nothing else can have the same number.