Which one of the following expressions gives the total number of distinct photon…

CHEMISTRY · Single correct · CBSE · Chemistry · Structure of Atom · Structure of Atom

Problem

Which one of the following expressions gives the total number of distinct photon lines that may appear in the emission spectrum of a hydrogen atom when an electron initially in the n2thn_2^{\text{th}} orbit (n2>1n_2>1) finally reaches the ground state? (a) n2−1n_2-1 (b) n2(n2+1)2\dfrac{n_2(n_2+1)}{2} (c) n2(n2−1)2\dfrac{n_2(n_2-1)}{2} (d) (n2−1)(n2−2)2\dfrac{(n_2-1)(n_2-2)}{2}

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