20.3 Wave Interference and Energy

1 / 15

# 20.3 Wave Interference and Energy - PowerPoint PPT Presentation

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….

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about '20.3 Wave Interference and Energy' - raheem

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### 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
• 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.
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