# 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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#### Presentation Transcript

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

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?

• 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.