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

Qualification => Subject Doubts => GCE O - Level => Sciences => Topic started by: jmarc on October 28, 2009, 03:03:27 am

Title: PHYSIC!!!!!!
Post by: jmarc on October 28, 2009, 03:03:27 am

 :-X I DNT HOW THE CATHODE RAY OSCILLISCOP WORKS AT ALL .......................CAN U HELP IN JUN 09 / O LEVEL /PHYSICS / PAPER2 THE QUES ON THE CATHODE RAY

Title: Re: PHYSIC!!!!!!
Post by: astarmathsandphysics on October 28, 2009, 08:00:28 am

Think x axis time
y axis volts
in i) they start of ith 1 square on the y axis =2V but then they change it so 2.5 squares on the y-axis =2V
iii)The beam moves from left to right across the screnn at a constant speed and up and down to show the voltage. The net effect is that the voltage at particular times is shown

Title: Re: PHYSIC!!!!!!
Post by: jmarc on October 28, 2009, 02:45:05 pm

Thanks........but what about part ii and to chec that 1 verical position represents 2V

Title: Re: PHYSIC!!!!!!
Post by: astarmathsandphysics on October 28, 2009, 03:26:46 pm

Apply a battery voltage of 2volts and see if it goes up one square

Title: Re: PHYSIC!!!!!!
Post by: astarmathsandphysics on October 28, 2009, 03:28:33 pm

Or 10v and 5 squares

Title: Re: PHYSIC!!!!!!
Post by: zara on October 28, 2009, 05:43:30 pm

have a look at the attached file.

Title: Re: PHYSIC!!!!!!
Post by: jmarc on October 28, 2009, 08:24:44 pm

Yeh Thanks alot!!!!!!

Title: Re: PHYSIC!!!!!!
Post by: astarmathsandphysics on October 28, 2009, 08:53:03 pm

I have written a page of cro notes which will go up tonight.

Title: Re: PHYSIC!!!!!!
Post by: toobeerajpanchoo on November 04, 2009, 02:43:27 pm

hey astar wanna know how you do calculate the time base and peak voltage

Title: Re: PHYSIC!!!!!!
Post by: astarmathsandphysics on November 04, 2009, 02:59:19 pm

Reading times no units per division

Title: Re: PHYSIC!!!!!!
Post by: nits94 on November 04, 2009, 04:27:26 pm

hey i hv my physics prac paper 2mrw.. n just want to know..what topics r realyl imp??? I guess making circuits, refraction, nd any more??? cuz there r 4 pracs...

Title: Re: PHYSIC!!!!!!
Post by: Ghost Of Highbury on November 04, 2009, 04:31:14 pm

Physics :
1) measurement and errors
2) Circuits and symbols
3) Constand variable ( like if there is an experiment some variables are supposed to be constant wat are they and etc.)
4) Temperature
5) Mirrors and lens
6) Proportional
7) Latent and heat loss
8 ) Time - pendulum always asked
9) Variable resistor
10) Rate of cooling

Title: Re: PHYSIC!!!!!!
Post by: Ghost Of Highbury on November 04, 2009, 04:37:56 pm

record readings from diagrams of apparatus e.g. current readings
• answer questions on the arrangement of apparatus
• complete tables of data
• draw conclusions from information
• answer questions about experimental data
• plot a graph from a table of readings
• interpret information from graphs
• draw ray diagrams
• identify sources of error and suggest improvements in the experiment
• suggest suitable apparatus for investigations

Title: Re: PHYSIC!!!!!!
Post by: toobeerajpanchoo on November 04, 2009, 07:11:35 pm

hey astar could u give me formula to calculate time period, time for one cycle in cro can't still how to do it its nov 2006 p4 and i am certain sure that tomorrow cro would definitely come out please help me astar

Title: Re: PHYSIC!!!!!!
Post by: nits94 on November 05, 2009, 04:09:52 am

Thanks A@di.. :) :)