1.

Wavelength of K_(a) line of X-ray spectra varies with atomic number as

Answer»

`lambda prop Z`
`lambda prop sqrtZ`
`lambda prop (1)/(Z^(2))`
`lambda prop (1)/(sqrtZ)`

Solution :According to moseley.s law, `sqrtV = a(Z-b) or V = C/(lambda) = a^(2)(Z-b)^(2) THEREFORE lambda INFTY (1)/(Z^(2))`


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