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When a hydrogen atom is in its first excited level, what is the relation of radius and Bohr radius?(a) Twice(b) 4 times(c) Same(d) HalfI had been asked this question during a job interview.The doubt is from Bohr Model of the Hydrogen Atom in portion Atoms of Physics – Class 12

Answer»

Right option is (b) 4 TIMES

The best EXPLANATION: For the FIRST excited level, n = 2.

r2 = (2)^2r0 = 4r0.

So, when a hydrogen atom is in its first excited level, its radius is 4 times of the Bohr radius.



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