NTNUJAVA Virtual Physics Laboratory
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JDK1.0.2 simulations (1996-2001) => Wave => Topic started by: Fu-Kwun Hwang on January 29, 2004, 05:47:37 pm



Title: Transverse Wave and Longitudinal Wave
Post by: Fu-Kwun Hwang on January 29, 2004, 05:47:37 pm
This java applet let you visualize the difference between transverse wave and longitudinal wave.
 You will find both moving wave and standing wave.



 Usage :
1. You can view transverse wave or longitudinal wave from the above selection.
2. Those blue lines on the left are dispacements relative to the equilibrium point, while those red lines on the right are relate to velocity of wave medium at those points.
3. The distance between two circle dots are 0.5 wavelength. (moving out of phase)
     Click and drag left mouse button to move them horizontally but keep the same distances.
     Click the right mouse button to locate position for one of the black dot,
         drag the right mouse button to position the second one.
         The distance between dots will be shown in unit of wavelength.
 4. Click the right mouse button and release it at the same location to toggle the animation.


Title: topic14
Post by: on January 30, 2004, 11:48:06 am
Subject:
Date:     Tue, 27 Apr 1999 23:05:21 +0100
From:     "Anthony Vinters" <Tony@g0wfg.demon.co.uk>
To:       <hwang@phy03.phy.ntnu.edu.tw>
I have found the tansverse and longitudinal waves. They are excellent,
exactly what is needed. Being able to show the the phases of particles
relative to each other is very useful.
I will be able to direct my students to your site so they can see for
themselves.
Once again thank you for your efforts the results are most pleasing.
Mr.A.E.Vinters.
Rishworth School


Title: hi
Post by: on March 27, 2004, 04:38:42 pm
no


Title: thanks
Post by: on May 18, 2004, 12:40:05 am

my name is nabeel razzaq......my A level physics exam is tomorrow morning....i discovered this site right now....and i swear it been a great help to me...now i am comfortable i know many things....my concepts are clear....thank you to how ever made this site.....high regards for him.... :P


Title: Re:u were trying to cheat and u knought it
Post by: on July 26, 2004, 10:11:58 pm

[quote:b36c9c9c8f="nabeel"]my name is nabeel razzaq......my A level physics exam is tomorrow morning....i discovered this site right now....and i swear it been a great help to me...now i am comfortable i know many things....my concepts are clear....thank you to how ever made this site.....high regards for him.... :P


Title: topic14
Post by: Patrick Roche on May 04, 2005, 02:37:57 am
I would very much appreciate getting the code for the transverse/longitudinal wave applet.


Title: topic14
Post by: Fu-Kwun Hwang on May 04, 2005, 07:15:26 am
You should have received it at your email account! However it was written many years ago with JDK1.0.2.


Title: transverse/longitudinal wave applet
Post by: chfahlke on December 29, 2005, 06:00:37 pm
Dear Dr Hwang,
I would very much appreciate getting the code for the transverse/longitudinal wave applet.
Thank you very much.
Sincerely yours,
Christoph Fahlke


Title: topic14
Post by: abdalla on January 07, 2006, 01:37:08 am
thanks ??? amazing :lol:


Title: topic14
Post by: royfairs on December 12, 2006, 08:33:17 pm

As a physics teacher of some 32 years I find this site has a compact collection of a lot of the demos I've used in a compact format. Well done. Is there any simple book that can be used to develop futher ones?

Thanx & rgds Roy



Title: topic14
Post by: Fu-Kwun Hwang on December 12, 2006, 10:01:58 pm
Some of the applets are created almost 8-10 years ago with JDK1.0.2.

However, there are many recently generated simulaton were build by a tool called Easy Java Simulation.

You can find out article about EJS from Easy java simulation (Download and related informations) (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=95.0)

You can find a book about EJS from Paco's web site (http://fem.um.es/). (Author of EJS)

And you should be able to download all the simulation when you login to the system.


Fu-Kwun :-)


Title: Re: Transverse Wave and Longitudinal Wave
Post by: Rennaman on April 02, 2007, 05:19:13 am
I just found this website. Thank you for taking the time to create it and make it available to teachers and students. I plan to use it in a lesson on waves this week!

Dave Menshew, M.A.Ed. NBCT
Lead Teacher, James C. Enochs High School
Forensic Biotech Career Pathway Program


Title: Re: Transverse Wave and Longitudinal Wave
Post by: rajettan on August 24, 2007, 07:14:11 am
your explanation and animations are great.but one doubt.why light is transverse?


Title: Re: Transverse Wave and Longitudinal Wave
Post by: Fu-Kwun Hwang on August 24, 2007, 09:34:33 pm
You can say it is the law of nature.
I do not know if you can accept the following explanation:

Light is electro-magnetic wave. It is the change of electric field which cause the magnetic field produced at near by space (the direction of induced magnetic field is perpendicular to electric field).
And the change of magnetic cause the electric field produced at near by space(the direction of induced electric field is perpendicular to the magnetic field).
Think about the direction of electric/magnetic flux and you will know the distribution of induced magnetic/electric field. 
And the above continuous process is what we called wave.
From the definition: we know it is a transverse wave. (I use other laws: Faradays's law etc. to explain the direction between E and B field)
Try to draw it by yourself on a piece of paper or look at it more closely at the simulation itself.


Title: Re: Transverse Wave and Longitudinal Wave
Post by: deb on September 26, 2008, 11:41:33 pm
This java applet let you visualize the difference between transverse wave and longitudinal wave.
 You will find both moving wave and standing wave.
<applet width="520" height="180" codebase="/java/waveType/" code="waveType.class"><param name="twave" value="transverse wave"><param name="lwave" value="longitudinal wave"><param name="shead" value="distance between dots = "><param name="unit" value=" wavelength"></applet>
 Usage :
1. You can view transverse wave or longitudinal wave from the above selection.
2. Those blue lines on the left are dispacements relative to the equilibrium point, while those red lines on the right are relate to velocity of wave medium at those points.
3. The distance between two circle dots are 0.5 wavelength. (moving out of phase)
     Click and drag left mouse button to move them horizontally but keep the same distances.
     Click the right mouse button to locate position for one of the black dot,
         drag the right mouse button to position the second one.
         The distance between dots will be shown in unit of wavelength.
 4. Click the right mouse button and release it at the same location to toggle the animation.
The article is very useful for my studies,thanks


Title: Re: Transverse Wave and Longitudinal Wave
Post by: Solar on October 27, 2008, 08:36:38 pm
Great simulation.
I have a question about waves.
I would like to know how can I calculate the value of the energy needed to make the "next" particle with a mass m in a string to start to oscillate. The wave for example is transverse.


Title: Re: Transverse Wave and Longitudinal Wave
Post by: Fu-Kwun Hwang on October 28, 2008, 04:20:46 pm
For a wave to continue spread out, you will need to supply energy continuously.
 dK= (1/2) (dm)*v2 =(1/2)* e*dx*v2
where e is the density per unit length.
P=dk/dt= (1/2)* e*dx/dt*v2= (1/2)*e*u *v2  (The power need to be supplied)
where u is the speed of the wave.
Because v is a function of time v=vo*sim(w*t), average of v2 will give you (1/2)vo2 and you will find average power.


Title: Re: Transverse Wave and Longitudinal Wave
Post by: nrgtik on January 28, 2009, 08:16:35 am
First, I would like to thank you, Mr Hwang, about the animation concerning the longitudinal and transverse waves. Even after almost 5 years this animation made me understanding easily the difference between these two types of waves.

I am interested in standing longitudinal wave and I would like to model numerically what happens (pressure temperature and velocity) inside a one-end closed tube.

If it is possible, could you please clarify me how can I proceed to reach my objective and which equations shall I use.

Thank you again for your kind help.

Best regards


Title: Re: Transverse Wave and Longitudinal Wave
Post by: lookang on January 28, 2009, 10:41:30 am
using a wave function plotter, i happen to know for transverse traveling wave the formula is



transverse wave

U(x,t) = Uo*sin(w*x-t)                        for right traveling wave

for stationary wave

U(x,t) = sin(t)*Uo*sin(w*x)
or
U(x,t) = Uo*sin(w*x-t)  +Uo*sin(w*x+t) 

for longitudinal wave

each particle is doing a motion U(x,t) = Uo*sin(w*x-t)  about it's own equlibrium with each obeying Uo*sin(w*x-t)

i did by  _view.trail.addPoint(x+0.9*u,0);

if you line them it will appear to be a longitudinal traveling wave


for stationary longitudinal wave
i suspect adding
U(x,t) = Uo*sin(w*x-t)  +Uo*sin(w*x+t) 
will work.


but i am not sure if it is pressure, will the equation need to differentiate? testing now


i await Prof hwang to reply


Title: Re: Transverse Wave and Longitudinal Wave
Post by: Fu-Kwun Hwang on January 29, 2009, 10:34:50 am
Quote
I am interested in standing longitudinal wave and I would like to model numerically what happens (pressure temperature and velocity) inside a one-end closed tube.

Sound wave is a pressure wave. Please write down in more detail:
1. temperature: do you mean temperature of the air? Temperature is a global quantity (average of kinetic energy of gas).
what do you mean by you want to model it numerically?
2. What is the velocity you are talking about? wave velocity? ...?


Title: Re: Transverse Wave and Longitudinal Wave
Post by: ferrari on November 06, 2009, 04:49:15 am
Can you tell me what metals have the greatest reflectivity properties for transverse and longitudinal waves.


Title: Re: Transverse Wave and Longitudinal Wave
Post by: Fu-Kwun Hwang on November 06, 2009, 08:00:53 am
When wave propagate from one media to another media,
 i.e. wave has different index of refraction (or wave speed is different in two different media),
then some wave will be reflected.
The closer the index of refraction, the less amount of wave will be reflected under the same conditions.
If you want more wave to be reflected, you need to find larger differences in index of refraction between two media.

For electromagnetic wave (or light), metal with better conductivity will has better reflectivity.


Title: Re: Transverse Wave and Longitudinal Wave
Post by: neetusharma on November 07, 2009, 02:09:03 pm
Good thing here to educate people on this but I think more than this is the translation in 16 languages that you have done.This increases the reach of this writeup.Good :)


Title: Re: Transverse Wave and Longitudinal Wave
Post by: Boomi on April 30, 2010, 02:57:42 pm
I 100% agree with you


Title: Re: Transverse Wave and Longitudinal Wave
Post by: mr_phys12 on May 31, 2010, 09:04:59 pm
Rest assured that I will spread physics mania to my students through this java applet..Thank's to you for sharing your expertise...


Title: Re: Transverse Wave and Longitudinal Wave
Post by: diinxcom on December 14, 2014, 05:36:46 pm
-*-
I agree... Hahaha  :D thank you!