Loading presentation...

Present Remotely

Send the link below via email or IM


Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.


Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

Waves & Sound

Overview of Chapter 25 & 26

Emily Schreiner

on 4 February 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Waves & Sound

Waves And Sound Conceptual Physics What is a wave? Period: the time of one back and forth cycle; measured in seconds
Period = 1 / frequency

Frequency: how frequently vibration occurs; measured in hertz
Frequency = 1 / period Transverse wave: particles move in right angles to the wave
Wavelength: the distance from the top of one crest to the top of the next one
Amplitude: distance from the Equilibrium Line to the Crest/Trough
Crest: the high points of a wave
Troughs: the low points of a wave Wavelength = Wave Speed / Frequency Standing waves: nodes remain stationary

Node is a point along a standing wave where the wave has the least amplitude

Antinode: occur halfway between nodes, positions on a standing wave with the largest amplitudes Doppler effect: change in frequency due to the motion of the source (ex. an ambulance)
Blue shift: an increase in frequency
Red shift: a decrease in frequency Forced Vibration: the vibration of an oject that is made to vibrate by another vibrating object that is nearby. The sound board in a musical instrument amplifies sound through forced vibrations

Natural frequency: an objects own special set of frequencies, depends of elasticity and the shape of an object Resonance: occurs when the frequency of forced vibrations in an object matches the objects natural frequency, amplitude dramatically increases

Beats: A Periodic variation in the loudness of sound Longitudinal waves: particles move along the direction of the wave
Compression: a pulse of compressed air
Rarefaction: disturbance in air when pressure is lowered
Wavelength: distance between adjacent compressions and rarefactions What is a vibration? A vibration is a wiggle in time A wave is a wiggle in time AND space Example: A pendulum Example: A slinky Practice! 1. A butterfly beats its wings 12 times in 3 seconds. Find the frequency and the period. 2. Laura can fly 50 times around the world in 5 minutes. Find the frequency and the period. Answers! 1. Frequency: 4 Hz
Period: 1/4 seconds 2. Frequency: 1/6 Hz Period: 6 seconds Transverse Wave Wave Interference Constructive Destructive (cancellation) (reinforcement) Amplitudes are added... -when crests overlap crests
-when troughs overlap troughs Waves are "in phase" Amplitudes are subtracted... -when crests and troughs overlap Waves are "out of phase" Longitudinal Waves Simple Harmonic Motion: A back-and-forth repetitive motion Pitch: frequency of the sound
Infrasonic: sound waves with frequencies below 20 hertz
Ultrasonic: sound waves with frequencies above 20,000 hertz Properties of Sound Practice! 1. A wave is traveling at 10 m/s with a frequency of 5 Hz. What is the wavelength?

2. A slinky has a wavelength of 3 meters and a frequency of 12 Hz. What is the wave speed?

3. A pendulum is swinging 500 m/s! The pendulum completes 10 cycles in 50 seconds. Find the wavelength. Answers! 1. 2 meters
2. 36 m/s
3. 2500 meters LOUDNESS corresponds to the amplitude of a wave
In a longitudinal wave, amplitude can be thought of as the pressure of density of a compression. What the heck is it? A continuous phenomena. It happens when an object is traveling at the speed of sound; waves are compressed into a single shock wave! An example is the cracking noise from a bullet being shot. Quality of Sound Timbre: the make-up of how much of each harmonic or overtone is played in each note. It's what makes instruments sound different from one another. = M/S ________________ Hertz These should look familiar... SONIC BOOOOOOOOM! A larger example... wavelength For Closed Captioning: www.youtube.com/watch?v=Kg9F5pN5tlI Audiogram ...what do you know about it? For closed captioning:
www.youtube.com/watch?v=-d9A2oq1N38 What do you know about pendulum and slinkies? Write everything that you know about them AND be as scientific as possible.
Full transcript