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What if we send a bunch of pulses down the spring and let them reflect back?

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. . Standing wave – a wave that remains in a constant position Formation: Incident pulses are reflected

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What if we send a bunch of pulses down the spring and let them reflect back?

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  1. 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.

  2. 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.

  3. Crest/antinode node Trough/antinode Parts of a Wave 3 x(m) 2 4 6 -3 y(m)

  4. Wave Parameters Wavelength (λ) amplitude amplitude 3 x(m) 2 4 6 Wavelength (λ) y(m) -3

  5. 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…

  6. 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?

  7. How are frequency and period connected? and • They are inverses of each other.

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