Question

In which transition, one quantum of energy is emitted?

• A. $n_2=4\to n_1=2$
• B. $n_2=3\to n_1=1$
• C. $n_2=2\to n_1=1$
• D. All of these

Answer 1

Answer: (D)

When an electron is de-excited from higher to lower energy level, a quantum of energy is emitted. Thus is true for all transition.