A hydrogen atom moving at a speed v absorbs a photon of wavelength 122 nm and stops. The value of v is -

Question

A hydrogen atom moving at a speed v absorbs a photon of wavelength 122 nm and stops. The value of v is -, 2.75 m / s, 3.25 m / s, 4.85 m / s, 5.65 m / s

MARKS App · Accepted Answer

Linear momentum of photon and electron are equal and opposite p = m = h λ ; v = h m λ = 6.62 × 1 0 - 34 1.67 × 1 0 - 27 × 122 × 1 0 - 19 v = 3.25 m / s

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