IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => GCE O - Level => Queries => Topic started by: farrukh494 on May 09, 2010, 10:39:20 am

Title: Physics atp urgent help needed
Post by: farrukh494 on May 09, 2010, 10:39:20 am

Hello everyone..I am new here and need some help because I have my paper tomorrow.

I would be thankful if someone takes the pains to clear the following

1.  know how to arrange a set square either side of a cylinder/sphere to measure diameter
2. know how to arrange apparatus so that it is parallel or perpendicular to a bench
3. use a fiducial aid when measuring a length, eg mark the middle of the lens on the bench
4. try to use a translucent screen
5. How to give a conculsion to an experiment?
6. always check polarities before closing the switch (completing the circuit)
7. Describe a simple experiment to demonstrate refraction of sound..
8.Is it necessary to plot all the points on the graph...For example we choose a convenient scale that covers the curve on a large part of the grid but one point can not be plotted on that scale so will marks be deducted??

Thankyou.


Please reply

Title: Re: Physics atp urgent help needed
Post by: DrEvil on May 09, 2010, 11:11:14 am

do u have the following book: Physics by Abbot

(http://www.whsmith.co.uk/Images/Products%5C435%5C670%5C9780435670146_m_f.jpg)

i'll recommend u this book for the experiments u have mentioned and it also explains everything very well...

try it or else let me find another solution...

Title: Re: Physics atp urgent help needed
Post by: farrukh494 on May 09, 2010, 02:23:53 pm

yes i do have this book but it doesn't clarify these things..thats why I am asking here..Can you please give reference it does clarify these things..
An experiment to demonstrate Refraction of Sound waves.
Advantages of using translucent screen in lens experiments??
How to use set square to measure diametre of cylinder?
How does speed of sound changes with density changes?

I can find solution to these and many problems..I will appreciate any help from you and thanks for your reply

Title: Re: Physics atp urgent help needed
Post by: DrEvil on May 09, 2010, 03:53:57 pm

An experiment to demonstrate Refraction of Sound waves:
I also had the same problem and for this i have contacted many teachers...I got a very poor response from everyone...they suggested that this experiment can be demonstrated by the use of tuning forks (but I really don't know how)...but when i searched the internet for this, the story was altogether different...i couldn't understand those experiments...I have never seen a question on the refraction of sound waves in the past papers from 1999 to 2009 so i'll suggest u to skip this one...  :D

How does speed of sound changes with density changes?
The more dense the air the faster will the sound will travel because the molecules of air are close together in dense air.

For now i can only answer these two...

Seem like u are also doing CIE GCE O Level...I also need help in physics...
https://studentforums.biz/index.php/topic,7192.new.html#new  :( :(