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

20.3 Wave Interference and Energy

Date, Section, Pages, etc.

Mr. Richter

agenda
Agenda
  • Warm Up
  • Collect Labs
  • Review HW
  • Introduction to Interference
  • Notes:
    • The Superposition Principle
    • Waves and Energy
objectives we will be able to
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
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 principle1
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 principle2
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
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
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 energy1
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
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
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
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
Homework
  • p. 447 #1, 2, 4, 5
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