Madhurig at 05:47, 18 October 2016

2016-10-18T05:47:46Z

Madhurig at 07:09, 29 October 2015

2015-10-29T07:09:09Z

Madhurig at 06:27, 10 October 2015

2015-10-10T06:27:23Z

Show changes

Nancyvarkey at 14:55, 19 September 2015

2015-09-19T14:55:59Z

Madhurig: Created page with "{| border=1 ||'''Visual Cue''' ||'''Narration''' |- ||'''Slide Number 1''' '''Title Slide''' || Hello everyone. Welcome to this tutorial on '''Characteristics of Sound Waves..."

2015-09-18T12:52:58Z

Created page with "{| border=1 ||'''Visual Cue''' ||'''Narration''' |- ||'''Slide Number 1''' '''Title Slide''' || Hello everyone. Welcome to this tutorial on '''Characteristics of Sound Waves..."

New page

{| border=1
||'''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'''

* How to generate a sound wave

* Frequency response of a sound source

* How to calculate velocity of sound

* Interference & Beats of sound waves

* Forced oscillations of sound source

Show

* Xmgrace plots

* Fourier Transforms

* Circuit diagrams
|| In this tutorial we will learn to demonstrate:

* How to generate a sound wave

* Frequency response of a sound source

* How to calculate velocity of sound

* Interference and Beats of sound waves

* Forced oscillations of a sound source.

And Show

* Xmgrace plots

* Fourier Transforms and

* Circuit diagrams for our experiments.
|-
|| '''Slide Number 4'''

'''System Requirement '''

* '''ExpEYES''' v 3.1.0

* '''Ubuntu Linux''' OS v. 14.10.
|| Here I am using,

* '''ExpEYES''' version 3.1.0

* '''Ubuntu Linux''' OS version 14.10
|-
|| '''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 as an audible mechanical wave of pressure and displacement, through a medium.

Air, water or metal surface.
|| 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.

The medium can be air, water or any metal surface.
|-
|| '''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 Phase'''button.
|| 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,

* Calculate the value of '''wavelength''' of sound.

* '''Formula: λ= v/f'''.
|| As an assignment, calculate the value of '''wavelength''' of sound.

Formula: '''λ= v/f'''.
|-
||'''Slide Number 16'''

* Interference

* Beats

* Xmgrace plot

* Fourier Transform.
|| Now we will demonstrate:

* Interference

* Beats

* Xmgrace plot and

* Fourier Transform of the two sources of sound.
|-
||'''Slide Number 17'''

Grace plots

* python-imaging-tk

* grace

* scipy
* python-pygrace.
|| To show '''Grace''' plots in the experiments:

Make sure that you have installed

* python-imaging-tk

* grace

* scipy and

* python-pygrace on your system.
|-
|| 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 on'''START''' 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.

'''https://en.wikipedia.org/wiki/Fourier_transform.'''
|| To know more about '''Fourier Transform ''' please visit this website.

'''https://en.wikipedia.org/wiki/Fourier_transform'''.
|-
||'''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 tutorials we have learnt to demonstrate:

* How to generate a sound wave

* Frequency response of a sound source

* How to calculate velocity of sound waves

* Interference and Beat pattern of sound waves

* Forced oscillations of sound source

And have shown:

* Xmgrace plots

* Fourier Transforms and

* Circuit diagrams for our experiments.
|-
| | '''Slide Number 22'''

'''Assignment'''

|| As an Assignment,

* Capture a sound burst

* Hint: A bell or a clap can be used as source of sound.

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

* If you do not have good bandwidth, you can download and watch it.
|-
|| '''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.

* Please contact us.
|-
|| '''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,

'''http://spoken-tutorial.org/NMEICT-Intro'''.
|| 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.

|}

@@ Line 259: / Line 259: @@
 '''Measure Phase'''
 We can obtain these values when '''Piezo''' is kept close & ''2cm'' away from '''MIC'''.
-||We can obtain these values when '''Piezo buzzer''' is kept close and ''2cm'' away from the'''MIC'''.
+||We can obtain these values when '''Piezo ''' is kept close and ''2cm'' away from the '''MIC'''.
 |-
 ||'''Slide Number 13'''
@@ Line 266: / Line 266: @@
 Ensure that '''MIC''' and '''Piezo buzzer''' are placed on the same axis.
-|| To obtain accurate results, ensure that '''MIC''' and '''Piezo''' are placed on the same axis.
+|| To obtain accurate results, ensure that '''MIC''' and '''Piezo buzzer''' are placed on the same axis.
 |-
 || '''Slide Number 14'''
@@ Line 440: / Line 440: @@
 '''https://en.wikipedia.org/wiki/Fourier_transform'''
-|| To know more about '''Fourier Transform ''' please visit this website.
+|| To know more about '''Fourier Transform ''' please visit this webpage.
 '''https://en.wikipedia.org/wiki/Fourier_transform'''.

@@ Line 155: / Line 155: @@
 |-
 || Drag the '''mSec/div''' slider.
-|| Drag the '''mSec/div''' slider to set in  '''compressions''' and '''rear-fractions'''.
+|| Drag the '''mSec/div''' slider to set in  '''compressions''' and '''rarefactions'''.
 |-
 || Click on '''CH2''', drag to '''FIT'''.

@@ Line 85: / Line 85: @@
 '''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.
 || 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.
 |-
 || '''Slide Number 7'''
@@ Line 271: / Line 273: @@
 ''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”.
@@ Line 460: / Line 460: @@
 '''Summary'''
-|| In this tutorials we have learnt to demonstrate:
+|| In this tutorial, we have learnt to demonstrate:
 * How to generate a sound wave

ExpEYES/C2/Characteristics-of-Sound-Waves/English - Revision history

Madhurig at 05:47, 18 October 2016

Madhurig at 07:09, 29 October 2015

Madhurig at 06:27, 10 October 2015

Nancyvarkey at 14:55, 19 September 2015

Madhurig: Created page with "{| border=1 ||'''Visual Cue''' ||'''Narration''' |- ||'''Slide Number 1''' '''Title Slide''' || Hello everyone. Welcome to this tutorial on '''Characteristics of Sound Waves..."