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Characteristic X-rays of frequency 4.2x...

Characteristic X-rays of frequency `4.2xx10^18` Hz are produced when transitions from L-shell to K-shell take place in a certain target material. Use Mosley's law to determine the atomic number of the target material. Given Rydberg constant `R =1.1xx10^7 m^(-1)`.

A

43

B

44

C

42

D

10

Text Solution

Verified by Experts

The correct Answer is:
C
We know that, `sqrt(f)=sqrt((3Rc)/4)(Z-1)`
or `sqrt(4.2 times 10^(18))=sqrt((3 times 1.1 times 10^(7) times 3 times 10^(8))/4)(Z-1)`
On solving, we get Z = 42
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