20 3 wave interference and energy
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20.3 Wave Interference and Energy. Date, Section, Pages, etc. Mr. Richter. Agenda. Warm Up Collect Labs Review HW Introduction to Interference Notes: The Superposition Principle Waves and Energy. Objectives: We Will Be Able To….

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20.3 Wave Interference and Energy

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20.3 Wave Interference and Energy

Date, Section, Pages, etc.

Mr. Richter


Agenda

  • Warm Up

  • Collect Labs

  • Review HW

  • Introduction to Interference

  • Notes:

    • The Superposition Principle

    • Waves and Energy


Objectives: We Will Be Able To…

  • Describe the superposition principle with constructive and destructive interference.

  • Explain which properties affect wave energy and why.


Warm-Up:

  • Can two waves be in the same place at the same time?

  • If yes, what do you think happens there?

  • If not, why not?


The Superposition Principle


The Superposition Principle

  • Waves are not physical things. They are energy.

  • This means the more than one wave can exist in the same place at the same time.

  • Think about sound: can you hear more than one thing at once?

    • Of course!


The Superposition Principle

  • When waves collide, their vibrations combine.

  • The superposition principle states that the total vibration at any point is the sum of the vibrations of each individual wave.


The Superposition Principle: Constructive Interference

  • Constructive interference occurs when two wave pulses combine to make a larger amplitude.

  • Example: if the number of guitars playing the same note is doubled, the amplitude is increased (it gets louder!)


The Superposition Principle: Destructive Interference

  • Destructive interference occurs when two wave pulses combine to make a smaller amplitude.

  • Example: noise-cancelling head phones.


Waves and Energy


Waves and Energy

  • Reminder: the main idea about waves –

  • Waves transfer energy from place to place without transferring matter.

  • There are two factors that affect the energy of a wave:

    • frequency – how often the energy arrives

    • amplitude – how much energy arrives each time


Waves and Energy: Frequency

  • The greater the frequency of a wave, the more energy it carries.

  • Wave energy is proportional to frequency.

  • Example: trying to whip a rope more often.


Waves and Energy: Amplitude

  • The greater the amplitude of a wave, the more energy it carries.

  • Wave energy is proportional to amplitude.

  • Example: turning up the volume.


Wrap-Up: Did we meet our objectives?

  • Describe the superposition principle with constructive and destructive interference.

  • Explain which properties affect wave energy and why.


Homework

  • p. 447 #1, 2, 4, 5


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