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The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is

Asked in NEET 2018 · Energy levels and ionisation

• (1) 2:-1
• (2) 1:-1
• (3) 1:1
• (4) 1:-2

Step-by-step solution

Why the other options are wrong

• (1) 2:-1 is the ratio of potential energy to kinetic energy, 2E:(-E). Measured against the total energy the potential energy gives 2:1, with no minus sign at all.
• (3) 1:1 drops the sign; the kinetic energy is positive while the total energy is negative, so the ratio has to be negative.
• (4) 1:-2 is the ratio of kinetic energy to potential energy, (-E):2E, which answers a different question from the one asked.

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