An X-ray tube is operating at 150 kV and 10 mA. If only 1% of the electric power supplied is converted into X-rays, the rate at which the target is heated in calories per second is

Options

A. 3.57
B. 35.7
C. 4.57
D. 15

Answer

A

Explanation

`P= VI = 150 xx 10^(3) xx 10 xx 10^(-3) = 1500 Js^(-1)`
Heating rate of target `= (1500)/(4.2) xx (1)/(100) = 3.57 cal s^(-1)`