About Me

My photo
I am a full time specialist Physics tutor operating in Klang Valley. I've been educating student for more than 10 years. My specialty is to transform student that had failed their physics subject into a better result. Even some of them managed to get an A in their final exam, You can read their testimony in this blog. I provide home tuition for physics subject to those living nearby KL especially around W.Maju, Ampang,Melawati and Setiawangsa. At the same time i 'm giving online tuition to all malaysia & overseas student. For tuition centre looking for a physics tutor, i'm also able to give seminar and conduct weekly classes. Meanwhile,for school teachers who are organising physics seminar, i am happy to assist u in that aspect. If u have enquiry on my service, do contact or whatsap me at 017-2877589 or email me at celikfizik @ gmail . com

Type SPM Physics Tips and click 'search' button:

Tuesday, February 17, 2009

SPM: Water Interference

Now lets examine what happen during water interference in a ripple tank..Look at this video



Observe the water ripples in the video above ..uniform water patterns are formed by 2 sources of ripple. These sources are coherent to each other. What does it mean by coherent sources???

coherent = waves produced at same frequency, amplitude and in phase

This interference pattern can be illustrated in diagram below..
Ok now..its time to describe what can be seen in the diagram..

i. - points where the crest meet crest or trough meet trough is known as antinode.
line joining these points is known as antinode line

ii. - points where crest meet trough is known as node.
line joining these points is known as node line

From this interference phenomena we can also calculate the wavelength
(λ). This is given by formula

λ = ax

D

a = distance between 2 coherent sources

x = distance between 2 consequtive node lines (or antinodal lines )

D = distance from coherent sources to the point of measurement of x


Ok..usually in SPM they will test you whether u know how to relate changes in a with respect to x & D.

Its about your maths skill..if u r gud in algebra..than it would be easy.

To let u understand this better, try this animation! (u need to have java applet installed)

2 comments:

Anonymous said...

last week our group held a similar discussion on this topic and you point out something we have not covered yet, appreciate that.

- Kris

Anonymous said...

nice post. thanks.

Recent Discussion

LinkWithin

Related Posts with Thumbnails

Topics Discussed