1.

How many elements are there in a row between those whose wavelength of k_(alpha) lines are equal to 250 and 179 p m?

Answer»

Solution :We calculate the `Ƶ` values CORRESPONDING to the given wavelength using Moseley's law.See problem (134).
Substitution GIVES that
`Ƶ=27` corresponding to `lambda=179 p m`
There are thus three elements in a row between those whose wavelengths of `K_(ALPHA)` LINE are equal to `250 p m` and `179p m)`.


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