Question

When excited electrons cascade to lower energy levels in an atom then :

• A. visible light is always emitted
• B. the potential energy of the atom increases
• C. the electrons always fall back to the first energy level
• D. the electron fall indiscriminately to all levels
• E. the electrons fall back to a lower unfilled energy level

Answer 1

The correct option is E the electrons fall back to a lower unfilled energy level

When excited electrons cascade to lower energy levels in an atom then electrons fall back to a lower unfilled energy level. During the process, these electrons lose some energy