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Question
In an X-ray tube if the electrons are accelerated through 140 KV then anode current obtained is 30 mA. If the whole energy of electrons is converted into heat then the rate of production of heat at anode will be
In an X-ray tube if the electrons are accelerated through 140 KV then anode current obtained is 30 mA. If the whole energy of electrons is converted into heat then the rate of production of heat at anode will be
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Solution
The correct option is D 1000 calorie
Charge passing through per second =30mC=30×10−3C
These are accelerated by a potential of 140KV
Energy passing through per second = q.V=30∗10−3×140×103=4200J
1 calorie=4.2J
Hence energy passing = 1000 calorie
Charge passing through per second =30mC=30×10−3C
These are accelerated by a potential of 140KV
Energy passing through per second = q.V=30∗10−3×140×103=4200J
1 calorie=4.2J
Hence energy passing = 1000 calorie
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