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Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 29 - Atomic Structure > The electron in a hydrogen atom jumps from ground state to the higher energy state where its velocity is reduced to one-third its initial value. If the radius of the orbit in the ground state is r the radius of new orbit will be

The electron in a hydrogen atom jumps from ground state to the higher energy state where its velocity is reduced to one-third its initial value. If the radius of the orbit in the ground state is r the radius of new orbit will be

Hydrogen atoms are excited from ground state of the principle quantum number 4. Then the number of spectral lines observed will be