Use Moseley's law with to find the frequency of the X-rays of La

PHYSICS · Subjective · CBSE · Physics · Electromagnetic Waves · Electromagnetic Waves

Problem

Use Moseley's law with

b=1

to find the frequency of the

K_\alpha

X-rays of La, where

Z=57

, if the frequency of the

K_\alpha

X-rays of Cu, where

Z=29

, is

1.88\times10^{18}\text{ Hz}