NEET 2019 · PhysicsEnergy levelsPrevious Year Question
The total energy of an electron in an atom in an orbit is –3.4 eV. Its kinetic and potential energies are, respectively:
Answer: (C) 3.4 eV, –6.8 eV. Answer: (c) 3.4 eV, –6.8 eV Solution: Total energy E = −3.4 eV.
- A.–3.4 eV, –3.4 eV
- B.–3.4 eV, –6.8 eV
- C.3.4 eV, –6.8 eV✓
- D.3.4 eV, 3.4 eV
Correct Answer
(C) 3.4 eV, –6.8 eV
Solution & Explanation
Answer: (c) 3.4 eV, –6.8 eV Solution: Total energy E = −3.4 eV. In a Bohr orbit KE = −E = +3.4 eV, and PE = 2E = 2(−3.4) = −6.8 eV. So KE, PE = 3.4 eV, −6.8 eV.
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