The operating voltage in an -X-ray tube is increased to 3 times the original value of when the short wavelength limits shifs by 25 nm. Find the original value or the opreating voltage.

Explanation

As we know, `(hc)/(lambda)=eVrArrlambdaprop(1)/(V)`
`:. " " (lambda_(1))/(lambda_(2))=(V_(2))/(V_(1))`
According to the question,
`(lambda)/(lambda-25)=(3V)/(V)`
`rArr" " lambda =3lambda-3xx25`
`rArr" "lambda=37.5 nm=375Å`
`:. E(ev)=(12375)/(lambda("in"Å))=(12375)/(375)=33.eV`
`rArr" " eV_(1)=33.eV`
`rArr" " V_(1)=33V`