What is the minimum xray wavelength produced by a dental xra

What is the minimum x-ray wavelength produced by a dental x-ray machine operated at 30 kV?

Solution

By Davisson and Germer experiment

1/lamda(nm) = 0.815*sqrt(V)

Given that V = 30000 V and lamda

1/lamda = 0.815*sqrt(30000) =141.16

lamda = 1/141.16 = 0.00708 nm = 7.08*10^-12 m