1.

The wavelength of K_(alpha) line from an element of atomic number 51 is lambda. From another element wavelength of K_(alpha) line is 4lambda. What is the atomic number of the second element ?

Answer»

25
26
100
99

Solution :`lambda alpha (1)/((Z-1)^(2)) so lambda alpha (1)/((51-1)^(2)) =(1)/(50)^(2)` for Ist CASE
In SECOND case, `4lambda alpha (1)/((Z.-1)^(2))`
`4 xx 1/50^(2)=(1)/((Z.-1)^(2))`
`or Z.-1=(50)/2=25`
`Z.=26`


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