Question
If the energy of an electron in the first Bohr orbit of the H-atom is -2.18 10^ -18 J then the energy of the electron in the second orbit will be
MHT CET
Chemistry
Structure of Atom
2026
MHT CET 2026 (13 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. -2.18 10^ -18 J
- B. -4.36 10^ -18 J
- C. -0.545 10^ -18 J
- D. -0.273 10^ -18 J
Answer
C. -0.545 10^ -18 J
Step-by-step solution
The energy of an electron in the n-th Bohr orbit of a hydrogen atom is given by E_n = E_1 n^2 . Given E_1 = -2.18 10^ -18 J and n = 2. Substituting the values, we get: E_2 = -2.18 10^ -18 2^2 E_2 = -2.18 10^ -18 4 E_2 = -0.545 10^ -18 J. Answer: -0.545 10^ -18 J
Related: Chemistry — Structure of Atom · All PYQ Banks