1. 1 2 3 4 5 A v

2. What if we send a bunch of pulses down the spring and let them reflect back? How will they interfere with one another? Go see what actually happens.

3. Standing wave Standing wave – a wave that remains in a constant position Formation: Incident pulses are reflected Reflections interfere with incident pulses If points of constructive and destructive interference don’t move, a standing wave forms.

4. Parts of a Wave 246 x(m) 3 -3 y(m) Crest/antinode Trough/antinode node

5. Wave Parameters 3 -3 246 x(m) y(m) amplitude Wavelength (λ) amplitude

6. How do you make more antinodes when creating a standing wave on the spring? Answer: Increase the frequency. Frequency: the number of cycles in a certain amount of time. – Usually cycles per second Units: hertz or Hz 50 Hz means “50 per second” There’s another idea related to frequency…

7. Period: the time it takes to complete one cycle. If a student oscillates a wave with a frequency of 5 cycles per second… – What is the frequency? – How long does it take to complete one cycle? If one cycle is 4 seconds… – What is the frequency? – What is the period?