The minimum kinetic energy of a ground state hydrogen atom required to have head-on collision with another ground state hydrogen atom but at rest to p

The minimum kinetic energy of a ground state hydrogen atom required to have head-on collision with another ground state hydrogen atom but at rest to p
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The minimum kinetic energy of a ground state hydrogen atom required to have head-on collision with another ... at rest to produce a photon is given by
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If so equipped, when should an aircraft display the anti-collision light? a. Only at night in flight, but not on the ground if being towed b. Whilst taxiing but not whilst being towed c. Only at night with engines running d. At all times on the ground when the engines are running

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