Question

can anyone pls explain this how to approach it . esp why n is taken as 2 in formula​

Answer 1

Answer:

The answer is B.

Explanation:

Because,radius of bohr orbit has formula 0.529×n^2/z.

And as per your doubt we have to take n=2 because,

n=1》 ground state.

n=2》first excited state.

And so.on....