Question

Which of the given electronic level would allow the hydrogen atom to emit a maximum of three type of photon?

• A. $1$
• B. $2$
• C. $3$
• D. $5$

Answer 1

The correct option is C $3$

On the absorption of a photon, an electron jumps from a lower state to a higher state and when energy is emitted, it falls from a higher to a lower state.

The lowest energy state of an atom is when $n=1$. So, emission of a photon is not possible for this level.

In option (b), for $n=2$ only one photon from $n=2ton=1$ is possible.
In option (c) for an electron in $n=3$, three photons are possible
$n=3ton=2,n=3ton=1,n=2ton=1$.