The current flowing through the X-ray tube which is operating at 25 kV is 1 mA. Calculate the number of electrons hitting target per second . Also, find the energy falling on the target per second.

Explanation

Current flowing in X-ray tube =1m A
Potential difference =25 kV
Current (I) is given by I="ne"
where, n =number of electrons hitting the target per second.
`:. " "n=(I)/(e)=(1xx10^(-3))/(1.6xx10^(-6))=6.25xx10^(15)`
Now, the energy falling on the target per second is equal to the power consumed by the X-ray tube i.e.,P=VI
Here, `V=24 kV=25xx10^(3)V`
`I=1mA=1xx10^(-3)A`
`:. " " P=(25xx10^(3))(1xx10^(-3))=25W`