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


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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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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

  • Reflections interfere with incident pulses

  • If points of constructive and destructive interference don’t move, a standing wave forms.


Crest/antinode

node

Trough/antinode

Parts of a Wave

3

x(m)

2

4

6

-3

y(m)


Wave Parameters

Wavelength (λ)

amplitude

amplitude

3

x(m)

2

4

6

Wavelength (λ)

y(m)

-3


  • 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…


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?


How are frequency and period connected?

and

  • They are inverses of each other.


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