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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 1 > Chapter 15 - Properties of Matter > The radius of hydrogen atom in its ground state is 5.3×10^−11m. After collision with an electron it is found to have a radius of 21.2×10^−11m. The principal quantum number of the final state of the atom is.

The radius of hydrogen atom in its ground state is 5.3×10^−11m. After collision with an electron it is found to have a radius of 21.2×10^−11m. The principal quantum number of the final state of the atom is.

In terms of Rydberg's constant R the wave number of the first Balmer line is