Manipulating Period and Frequency

For today's class we first started by correcting question 1-5 of the sheet "Describing Waves"

Here are the following answers just in cased some of you guys missed it:

1. Crests: B,E Troughs: D,G Neither: A,C,F,I,H,J

2. A is the wavelength and D is the amplitude

3. a) 3.9 b) 0.8 (it doesn't matter if your off by a bit)

4. frequency

5. a) 1/60 hz

After the worksheet corrections we were assigned to do a lab "Manipulating Period and Frequency"

For the lab we were supposed to be in pairs or in a group of 3, we first had to answer question 1-3 of the sheet (worth 3 marks) after answering the questions the procedure of the lab is at the back of the paper.

- we had to measure our pulse for 30s: first in a calm environment and then a measure of our pulse after a light activity such as running up the stairs 3-4 times.

- then we had to figure out the bpm, frequency and the period

- After measuring our pulse we then had a chance to experiment with the pendulum (the strings hanging from the ceiling with a small weight attached at the bottom)

- For the experiment the bob (mass) is pulled one meter horizontally from where it is hanging

- We then release the bob and it starts swinging back and forth

- Count 15 full oscillation timing it, record your trials (you need 3 trials) and fill in the frequency and period of each trial.

- After the pendulum experiment we then moved on to one of the hanging mass on a spring apparatuses

- We pull the mass 15 cm below its equilibrium point

- Let go and count 15 full oscillations and record the time

- You'll need three trials, and after you've gotten your recored time fill in the frequency and period

Well.. thats pretty much what we did today. LABS ARE DUE FRIDAY! and we got our test back

- PAR