Qualification > Sciences
ALL PHYSICS DOUBTS - POST HERE !!
Ghost Of Highbury:
--- Quote from: Ivo on May 25, 2010, 06:44:26 pm ---By the way, is heat of cathode to aid the thermionic emission?
--- End quote ---
Yes
Ivo:
--- Quote from: ~VIN1094~ on May 25, 2010, 06:44:56 pm ---same as P = I2R
where P is the power loss due to heat ..
--- End quote ---
The reason behind P=(I^2)R:
Combine P=IV and V=IR then you get the above equation!
Vin:
--- Quote from: Ivo on May 25, 2010, 06:43:02 pm ---I'm just saying the potential difference between cathode and anode is 600V d.c.
--- End quote ---
FYI, :P because in the question its 600 V .. rest of the world uses 10,000 to 60,000 V for CROs ;)
soraam:
http://www.freeexampapers.com/FreeExamPapers.com_.php?__lo=SUdDU0UvUGh5c2ljcy9DSUUvMjAwNiBKdW4vMDYyNV9zMDZfcXBfMS5wZGY=
question 37
i know why its positive but the second part is kinda unreasonable
the answer is C ...
but why??
Fastal:
only the cathode gets red hot. the anode just focuses the electrons onto the flourescent screen. its relatively cool to the cathode
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