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An X-ray tube operated at a DC potential difference of 40 kV, produces heat at a rate of 720 W. Assume that 0.5% of energy of the electron is converted into X-rays. Calculate (i) the number of electrons per second striking the target; (ii) the velocity of the incident electron. The charge-to-mass ratio of the electron, e/m = 1.8 ´ 10 11 C Kg -1 .


An X-ray tube operated at a DC potential difference of 40 kV, produces heat at a rate of 720 W.  Assume that 0.5% of energy of the electron is converted into X-rays. Calculate
(i)         the number of electrons per second striking the target;    
(ii)        the velocity of the incident electron. The charge-to-mass ratio of the electron, e/m = 1.8 ´ 1011 C Kg-1.


Grade:9

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