Solid targets of different elements are bombarded by highly energetic electron beam. The frequcny `(f)` of the characteristic `X`-rays emitted from different targets varies with atomic number `Z` as

Options

A. `f prop sqrt(Z)`
B. `f prop Z^(2)`
C. `f prop Z`
D. `f prop Z^(3//2)`

Answer

B

Explanation

`lambda prop (1)/(Z^(2)) rArr ( c )/(v) prop (1)/(Z^(2)) rArr v prop Z^(2)`