1.

K_(alpha) radiation of Mo (Z = 42) has a wavelength of 0.71Å. Calculate wavelength of the corresponding radiation of Cu (Z=29)

Answer»

`1.45Å`
`1.52Å`
`0.52Å`
`1.02Å`

Solution :From the Mosley.s law, we have
`V=a(Z-SIGMA)^(2)`
for `K_(alpha)` radiationscreening CONSTANT `sigma =1 and v=(c)/(lambda)`
`:. (1)/(lambda) prop (Z-1)^(2)`
`(lambda_(Cu))/(lambda_(MO))=((Z_(Mo)-1)^(2))/((Z_(Cu)-1)^(1))=(41^(2))/(28^(2))`
`:. lambda_(Mo)=0*71Å`
Then `lambda_(Cu)=(0.71)Åxx(41^(2))/(28^(2))=1*52Å`


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