An X-ray tuve operated at 50 kV produces heat a the target at the rate of 796 watt. If only `0.5%` energy of incident electrons is converted into X-ray, then find the number of electrons striking the target per second.

Explanation

Heat produced `= (100 - 0.5)% xx ` incident energy
`(99.5)/(100) xx V xx I xx t`
`796 xx t = 0. 995 xx V xx n e xx t`
or `796 = 0.955 xx (50 xx 10 ^(3)) xx n xx (1. 6 xx 10 ^(-19))`
or `n = (796)/(0. 995 xx (50 xx 10 ^(3)) x (1. 6 xx 10 ^(-19)))`
`or n = 10 ^(17).`