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In Bohr’s atomic model of hydrogen, let K, P and E are the kinetic energy, potential energy and total energy of the electron respectively. Choose the correct option when the electron undergoes transitions to a higher level:

1. All K, P and E increase
2. K decreases, P and E increase
3. P decreases, K and E increase
4. K increases, P and E decrease

Correct answer: K decreases, P and E increase

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