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Find the number of energy state and energy levels in the rang E < [15R /(8 ma)] of a cubical box of side a.

Find the number of energy state and energy levels in the rang E < [15R /(8 ma)] of a cubical box of side a. Hint: For a particle in a cubic box of side a, the energy is given by (n +n + n) E h 2ma

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