Question

Which of the following electron transition in hydrogen atom will require the energy equivalent to its ionization energy ?

• A. from $n=1$ to $n=2$
• B. from $n=2$ to $n=3$
• C. from $n=1$ to $n=3$
• D. from $n=1$ to $n=\infty$

Answer 1

Answer: (D)

from $n=1$ to $n=\infty$

Explanation:

A hydrogen atom is said the be ionised when the electron of the hydrogen jump to that energy level where the electron does experience any force of attraction from the nucleus. That energy level will be -- n(f) = ∞

Here, there is only one case where the electron goes to an infinite energy level that is (D) option

So, (D) is the correct option.