Beat Frequency.

Slides:

Advertisements

Similar presentations

Superposition and Standing Waves

Advertisements

Beats and Resonance Sections 9.3 and 9.4.

MUSIC NOTES Noise Versus Music  What is the difference between noise and music?  Answer: The appearance of the waveform.  What is the difference between.

Physics for Scientists and Engineers, 6e

Physics 12 Source: Giancoli Chapters 11 and 12

SOUND Chapter Twenty-Four: Sound  24.1 Properties of Sound  24.2 Sound Waves  24.3 Sound Perception and Music.

SPH3U Exam Review Waves and Sound.

Sound Waves - Beats Wei-En Hsu Center for Advanced Computation and Telecommunications UMass Lowell.

SPH3U – Physics 11 University Preparation – Unit 4 – Waves & Sound Created by: Mr. D. Langlois – GECDSB – SPH3U - Unit 4.

Sound lab Digital piano Oscilloscope with speakers

Chapter 12 Objectives Differentiate between the harmonic series of open and closed pipes. Calculate the harmonics of a vibrating string and of open and.

Sound Origin of Sound Nature of Sound in Air Media that Transmit Sound

Resonance, Sound Intensity, & Sound Quality Resonance, Sound Intensity, & Sound Quality.

2.4 Addition of waves Simulation bcs/Books?action=mininav&bcsId=4768&itemId= &assetId =160342&resourceId=15301&newwindow=true.

The Principle of Linear Superposition and Interference Phenomena CHAPTER 17 Interference Constructive and Destructive Interference: BEATS Standing Waves:

1© Manhattan Press (H.K.) Ltd. 9.6Beats Beats (SB p. 50) Interference What is the effect of the superposition of two sound waves of slightly different.

Explain what beats are and why they occur… 1)When two sounds are slightly different in frequency, a “warbling” beat is heard 2)This is because the two.

ALL sounds are produced by vibrations. Sound waves travel as longitudinal (compressional) waves. Compression – region of high molecular density and.

Unit 04 - Sound. Beat Frequency  When two sounds of slightly different frequencies are played together, the result is a sound with an alternating loud-soft.

Chapter Twenty-Four: Sound  24.1 Properties of Sound  24.2 Sound Waves  24.3 Sound Perception and Music.

Unit 10: Sound.

Conceptual Physics Notes on Chapter 25 Sound. Sound   All sounds are produced by the vibrations of material objects.   Pitch describes our impressions.

Sound and Wave Interference

Day 6 Exam I is on Thursday. Be sure to attend lab this week.

Waves. Wave: A disturbance that is transmitted from one place to the next with no actual transport of matter. All waves start with a vibration. All waves.

More On Sound. Quality How you can tell one sound source from another even when playing the same frequency Depends on the presence of overtones.

Selected slides from lectures of February 5 and February 7.

Chapter 8.2 Notes Wave Interactions Wave Interactions.

More Waves in Music and Sound Decibels, Interference and Doppler Effect.

14-6 The Doppler Effect The Doppler effect is the change in pitch of a sound when the source and observer are moving with respect to each other. When an.

Harmonics. Each instrument has a mixture of harmonics at varying intensities Principle of superposition Periodics- Repeating patterns of waveforms.

Mechanical Waves Introduction – Waves Webquest

Beats AP Physics 1.

PHYSICS CLASS ACTIVITY. CLASS ACTIVITY: TUNING FORK FREQUENCY.

Resonance. Resonance of Sound waves Strike one fork with a rubber hammer, then cover the fork. Describe what you hear? tuning fork Sound box.

1. A pulse traveling along a bullwhip is an example of a __________ wave.

Sound Waves. Sound is a compressional or longitudinal wave The “wiggle” (compression) is in the same direction as the wave travels.

Beat Frequency beat frequency is a fluctuating volume of sound it occurs when two sound waves of slightly different frequency are heard together constructive.

The Principle of Linear Superposition and Interference Phenomena CHAPTER 17 Interference Constructive and Destructive Interference: BEATS Standing Waves:

12-3 Harmonics.

Sound Review Natural frequency: –The frequency or frequencies at which an object tends to vibrate What is an example of a sounding board and.

Resonance in a Closed Air Column when longitudinal sound waves are emitted down a closed air column, the closed end reflects waves back in the same way.

Holt Physics Chapter 13 Sound.

The Nature of Sound and its Applications. Sound is produced by vibrations Sound is a compression(longitudinal) wave.

 The of an object that is made to vibrate by that is  a tuning fork   the sound through vibrations  a guitar.

Waves & Sound Review Level Physics.

Waves & Sound Review Level Physics.

Wave Interference A material object will not share its space with another object, but more than one wave can exist at the.

Chapter Twenty-Four: Sound

Discuss in pairs how does a lion roar?

Superposition of Unequal Frequency Waves

Sound Elaine S. Vejar NSF GK-12 Fellow-Vibes and Waves in Action

Section 3: Wave Interactions

Conceptual Physics Notes on Chapter 26 Sound.

Sound Or Can You Hear Me Now? Standards:

Wave interference and Beat Frequency

Superposition of Unequal Frequency Waves

Phase Two quantities are in phase if they are simultaneously increasing or decreasing, eg V & I are in phase in an AC circuit Waves in phase.

Phase Two quantities are in phase if they are simultaneously increasing or decreasing, eg V & I are in phase in an AC circuit Waves in phase.

14-7 Superposition and Interference

Superposition Superposition is the ability of waves to superimpose (add displacements & energy) as they move through each other. Constructive interference.

Superposition Superposition is the ability of waves to superimpose (add displacements & energy) as they move through each other. Constructive interference.

Section2 :Wave Properties Wave: disturbance that carries energy

Chapters Sound and Musical Sounds Ch20 Homework:

Presentation transcript:

Beat Frequency

Two identical tuning forks Two non-identical tuning forks Tuning Fork Demos Two identical tuning forks Two non-identical tuning forks

The Interference Pattern One Beat

Beat A Beat is created by interference between two nearly identical sound waves Beat – a periodic change in sound intensity one beat is from loud to soft and back to loud (constructive to destructive and back to constructive interference)

How a Beat is produced when a rarefaction from one fork coincides with a compression from the other fork you get destructive interference and soft sound when a rarefaction meets a rarefactions (or 2 compressions) you get constructive interference and louder sound

Beat Frequency – the number of beats heard per second in Hertz Beat frequency = number of beats Total time Beat frequency is also the difference between the frequencies of the two sources Beat Frequency = Higher freq. – lower freq. =  f2 - f1 

Sample Problem A piano key with a frequency of 266 Hz is hit at the same time as a tuning fork. Seven beats are heard in 2.5 s. What are the possible frequencies of the tuning fork?

Questions Explain how beats are created. Refer to the principle of superposition. You are tuning a guitar by comparing the sound produced by the string with the sound produced by a standard tuning fork. You notice a beat frequency of 5 Hz when both sounds are present. As you tighten the guitar string, the beat frequency rises steadily to 8 Hz. In order to tune the string exactly to the tuning fork, should you continue to tighten the string or loosen the string? Explain your answer. An airplane mechanic notices that the sound from an aircraft with two engines varies rapidly in loudness when both engines are running. What could be causing this variation from loud to soft? The two waveforms in Figure 5 have the same amplitude but different frequencies. They are interfering with each other. Copy the two waveforms into your notebook, and draw the resulting beat pattern. Mark the points of constructive interference and destructive interference.