Difference between revisions of "ExpEYES/C2/Characteristics-of-Sound-Waves/English"
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'''Definition of Sound'''. | '''Definition of Sound'''. | ||
| − | '''Sound''' is a vibration that propagates as an audible mechanical wave of pressure and displacement, through a medium. | + | '''Sound''' is a vibration that propagates |
| − | + | *as an audible mechanical wave of pressure and displacement, | |
| − | Air, water or metal surface. | + | *through a medium. |
| + | * Eg; Air, water or metal surface. | ||
|| Let's first begin with definition of Sound. | || Let's first begin with definition of Sound. | ||
| − | '''Sound''' is a vibration that propagates as an audible mechanical wave of pressure and displacement, through a medium. | + | '''Sound''' is a vibration that propagates |
| − | + | *as an audible mechanical wave of pressure and displacement, | |
| − | The medium can be air, water or any metal surface. | + | *through a medium. |
| + | *The medium can be air, water or any metal surface. | ||
|- | |- | ||
|| '''Slide Number 7''' | || '''Slide Number 7''' | ||
| Line 271: | Line 273: | ||
''v=350m/sec'' | ''v=350m/sec'' | ||
| − | || To calculate the value of velocity of sound, | + | || To calculate the value of velocity of sound, we have the formula as shown: |
| − | + | ||
| − | we have the formula as shown: | + | |
Velocity of sound obtained from the experiment is “350m/sec”. | Velocity of sound obtained from the experiment is “350m/sec”. | ||
| Line 460: | Line 460: | ||
'''Summary''' | '''Summary''' | ||
| − | || In this | + | || In this tutorial, we have learnt to demonstrate: |
* How to generate a sound wave | * How to generate a sound wave | ||
Revision as of 20:25, 19 September 2015
| Visual Cue | Narration |
| Slide Number 1
Title Slide |
Hello everyone.
Welcome to this tutorial on Characteristics of Sound Waves. |
| Slide Number 2+3
Learning Objectives
Show
|
In this tutorial we will learn to demonstrate:
And Show
|
| Slide Number 4
System Requirement
|
Here I am using,
|
| Slide Number 5
Pre-requisties You should be familiar with: ExpEYES interface. For relevant tutorials, visit our website. www.spoken-tutorial.org. |
To follow this tutorial, you should be familiar with:
ExpEYES Junior interface. If not, for relevant tutorials, please visit our website. |
| Slide Number 6
Definition of Sound. Sound is a vibration that propagates
|
Let's first begin with definition of Sound.
Sound is a vibration that propagates
|
| Slide Number 7
Characteristics of sound. Carry out various experiments to show characteristics of sound waves. |
In this tutorial we will carry out various experiments to show characteristics of sound waves. |
| Slide Number 8
Frequency of sound. Experiment to show frequency of sound waves. |
Let's perform an experiment to show frequency of sound waves. |
| Show the circuit diagram. | In this experiment, ground(GND) is connected to Piezo buzzer(PIEZO).
Piezo buzzer(PIEZO) is connected to SQR1. Microphone(MIC) is connected to A1. Here Piezo buzzer(PIEZO) is a source of sound. This is the circuit diagram. |
| Let's see the result on the Plot window. | |
| Point to Setting Square waves set frequency as 3500Hz. | On the Plot window, under Setting Square waves, set the frequency as 3500Hz. |
| Click on SQR1 check box.
Point to SQR1 check box. Point to the sound wave. |
Click on SQR1 check box.
Frequency of SQR1 is set to 3500Hz. A digitised sound wave is generated. |
| Move the frequency slider. | Move the frequency slider to change the waveform. |
| Click on SQ1 drag to CH2.
Point to the assigned data. Point to the square wave. |
Click on SQ1 and drag to CH2.
Input data of SQ1 is assigned to CH2. A square wave is generated. |
| Drag the mSec/div slider. | Drag the mSec/div slider to set in proper compressions and rear-fractions. |
| Click on CH2, drag to FIT.
Point to voltage and frequency of SQ1. |
Click on CH2 and drag to FIT.
Voltage and frequency of SQ1 is displayed on the rightside. |
| Move the frequency slider. | Move the frequency slider to set in sound waves |
| Point to the sound wave.
Point to the amplitutde. |
Sound wave produced by the Piezo buzzer is shown in black colour.
Amplitude of the wave changes as Piezo buzzer is moved closer and away from the MIC. |
| Slide Number 9
Frequency response Demonstrate frequency response of Piezo buzzer. |
Now we will demonstrate frequency response of Piezo buzzer. |
| Click on EXPERIMENTS button.
Select Experiment list opens, Click on Frequency Response. |
On the Plot window click on EXPERIMENTS button.
Select Experiment list opens. Click on Frequency Response from the list. |
| Point to two new windows.
Point to the circuit diagram |
Two new windows Audio Frequency response Curve and Schematic open.
Schematic window shows, circuit diagram of the experiment. |
| Point to Audio Frequency response Curve window, click on START button. | On the Audio Frequency response Curve window click on START button. |
| Point to Frequency response of the Piezo buzzer.
Point to the amplitide. |
Frequency response of the Piezo buzzer is set in.
Frequency response has maximum amplitude at 3700Hz. |
| click on Grace button.
Point to the Grace window Frequency response Curve |
On the same window click on Grace button.
Grace window opens showing Frequency response Curve |
| Slide Number 10
Velocity of Sound Measure velocity of the source of sound. |
Now we will measure velocity of the source of sound. |
| Click on EXPERIMENTS button.
Point to the list. Click on Velocity of Sound. |
On the Plot window click on EXPERIMENTS button.
Select Experiment list opens. Click on Velocity of Sound from the list. |
| Point to the new windows.
Point to the circuit daigram on Schematic window. |
Two new windows EYES Junior: Velocity of Sound and Schematic open.
Schematic window shows the circuit diagram of the experiment. |
| Click on Measure Phase button. | On EYES Junior: Velocity of Sound window click on Measure Phase button. |
| Move the Piezo buzzer to different distances. | We can obtain different Phase values by changing the distance between MIC and Piezo buzzer. |
| Click on Measure Phasebutton. | Click Measure Phase button to obtain different Phase values. |
| Slide Number 11
From the various Phase values we will use 178deg and 106deg to calculate velocity of sound |
From the various Phase values we will use 178deg and 106deg to calculate velocity of sound. |
| Slide Number 12
These values can be obtained when Piezo buzzer is kept close to the MIC and 2cm away from the MIC |
These values can be obtained when Piezo buzzer is kept close to the MIC and 2cm away from the MIC respectively. |
| Slide Number 13
Note Ensure that MIC and Piezo are placed on the same axis. |
To obtain accurate results, ensure that MIC and Piezo are placed on the same axis. |
| Slide Number 14
Velocity of sound. v=f *(360 * ∆D/X) v= 3500(360*2/(178-106) v=35000cm/sec v=350m/sec |
To calculate the value of velocity of sound, we have the formula as shown:
Velocity of sound obtained from the experiment is “350m/sec”. |
| Slide Number 15
Assignment As an assignment,
|
As an assignment, calculate the value of wavelength of sound.
Formula: λ= v/f. |
Slide Number 16
|
Now we will demonstrate:
|
| Slide Number 17
Grace plots
|
To show Grace plots in the experiments:
Make sure that you have installed
|
| Show the picture. | In this experiment we use two Piezo buzzers as source of sound. |
| Point to the circuit diagram. | In this experiment Piezo1 is connected to SQR1 and ground(GND).
Piezo2 is connected to SQR2 and ground(GND). This is the circuit diagram. |
| Let's see the result on the Plot window. | |
| Set the value of SQR1 as 3500Hz. | On the Plot window, set frequency as 3500Hz. |
| Click on SQR1 and SQR2 check boxes.
Point to the check boxes. Point to the sound wave. |
Click on SQR1 and SQR2 check boxes.
Frequency of SQR1 and SQR2 is set to “3500Hz”. A digitised sound wave is generated. |
| Click on Experiments button, Interference of Sound.
Point to EYES: Interference of Sound window. |
Click on EXPERIMENTS button and select Interference of Sound.
EYES: Interference of Sound window opens. |
| Change NS value to 1000. | At the bottom of the window, change NS that is number of samples value to 1000. |
| Click on SQR1, SQR2 check boxes.
Click on START button. |
Click on SQR1 and SQR2 check boxes.
Click on START button, Interference pattern is seen. |
| Click on Xmgrace button.
Point to the Grace pattern. |
Now click on Xmgrace button.
A new window opens with a Grace pattern. |
| Now we will show Beats pattern. | |
| Click on Experiments button, select Interference of Sound.
Point to EYES: Interference of Sound window. |
Click on Experiments button and select Interference of Sound.
EYES: Interference of Sound window opens. |
| Click on SQR1 and SQR2 check boxes. | At the bottom of the window, Click on SQR1 and SQR2 check boxes. |
| Click onSTART button.
Point to Beats pattern. |
Click on START button.
Beats pattern appears. |
| click on Xmgrace button. | Now click on Xmgrace button.
A new window opens with a Grace pattern. |
| Click on FFT.
Point to Fourier Transform. |
Click on FFT.
A new window opens with Fourier Transform. |
| Slide Number 19
Fourier Transform Fourier Transform please visit this webpage. |
To know more about Fourier Transform please visit this website. |
| Slide Number 20
Low Frequency Sound Wave To show a low frequency sound wave. |
Let us perform an experiment to show a low frequency sound wave.
This is the circuit diagram. |
| Click on Experiments button select Interference of Sound.
Point to EYES: Interference of Sound window. |
Click on EXPERIMENTS button and select Interference of Sound.
EYES: Interference of Sound window opens. |
| Set the value of 'SQR1 to 100, check the box. | At the bottom of the window, set the value of SQR1 to 100 and check the box. |
| Click on START button.
Point to the wave. |
Click on START button, a low amplitute wave is displayed. |
| Click on FFT. | Click on FFT to obtain a Grace plot of Fourier Transform. |
| Let's summarize. | |
| Slide Number 21
Summary |
In this tutorial, we have learnt to demonstrate:
And have shown:
|
| Slide Number 22
Assignment |
As an Assignment,
This is the circuit dagram. |
| Slide Number 23
Acknowledgement Watch the video available at http://spoken-tutorial.org/What is a Spoken Tutorial. It summarises the Spoken Tutorial project. If you do not have good bandwidth, you can download and watch it. |
* This video summarises the Spoken Tutorial project
|
| Slide Number 24
The Spoken Tutorial Project Team, Conducts workshops using spoken tutorials. Gives certificates to those who pass an online test. For more details, please write to contact@spoken-tutorial.org |
* We conduct workshops using Spoken Tutorials and give certificates.
|
| Slide number 25
Spoken Tutorial Project is a part of the Talk to a Teacher project. It is supported by the National Mission on Education through ICT, MHRD, Government of India More information on this Mission is available at, |
The Spoken Tutorial Project is funded by NMEICT, MHRD Government of India. |
| This tutorial is contributed by Kaushik Datta and Madhuri Ganapathi.
This is Sakina Sidhwa. Thank you for joining. |
