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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 18 - Atoms and Nuclei > Characteristic X-rays of frequency 4.2×10^18 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 =1.1×10^7 m^(-1).

Characteristic X-rays of frequency 4.2×10^18 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 =1.1×10^7 m^(-1).

Beta rays emitted by a radioactive material are.