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NEET-XII-Physics

12: Atoms

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  • #10
    In accordance with the Bohr’s model, find the quantum number that characterises the earth’s revolution around the sun in an orbit of radius 1.5 × 1011 m with orbital speed 3 × 104 m/s. (Mass of earth = 6.0 × 1024 kg.)
    Ans : Radius of the orbit of the Earth around the Sun, r = 1.5 × 1011 m

    Orbital speed of the Earth, ν = 3 × 104 m/s

    Mass of the Earth, m = 6.0 × 1024 kg

    According to Bohr’s model, angular momentum is quantized and given as:



    Where,

    h = Planck’s constant = 6.62 × 10-34 Js

    n = Quantum number



    Hence, the quanta number that characterizes the Earth’ revolution is 2.6 × 1074.