Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
Ghost Of Highbury:
--- Quote from: Shazizzzle on May 25, 2010, 06:16:47 pm ---Has anyone considered answering MY question?!
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i cant open the paper,,
omair:
--- Quote from: NightHawkerr on May 25, 2010, 06:25:47 pm ---Can anyone tell me the basic points i need to know about the cathode ray tube? Because there seems to be questions about it in every past papers i've done, and i dont really understand it.
Thanks :D
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dude remember how to find voltage that is voltage gain*amplitude
and timeperiod that is to multiply timebasewith wave lenth
also make sure u know how to find out y-plates are made more positive up or down to find out where ther beam deflects
Ivo:
Please can you see if the following is accurate, please also confirm that heat loss is due to increase of current.
--- Quote ---The answer is A, because if thicker wires are used, resistance is less, so current is less, as voltage is constant (I=V/R).
In transformers, for the same power, voltage is increased and so current has decreased, so there is less heat (I=P/V).
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Vin:
--- Quote from: Shazizzzle on May 25, 2010, 06:16:47 pm ---Has anyone considered answering MY question?!
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oh sorry i didnt see urs ..potential difference required for producing cathode rays is really high to produce high energy electrons .. also d.c. is required .. think about it .. u want to produce electrons from the cathode .. if its ac than cathode and anode would constantly be changing ;)
Ivo:
--- Quote from: ~VIN1094~ on May 25, 2010, 06:30:25 pm ---oh sorry i didnt see urs ..potential difference required for producing cathode rays is really high to produce high energy electrons .. also d.c. is required .. think about it .. u want to produce electrons from the cathode .. if its ac than cathode and anode would constantly be changing ;)
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FYI, the p.d. you stated is 600V.
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