JEE PHYSICS MCQ: ATOMS

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Application +4 | -1

Hydrogen atom emits blue light when it changes from

n = 4

energy level to the

n = 2

level. Which colour of light would the atom emit when it changes from the

n = 5

level to the

n = 2

level

View answer and explanation

Correct option: D

Violet

Option D (Violet) is correct because transitions to lower energy levels release more energy, and the transition from n=5 to n=2 releases more energy than the transition from n=4 to n=2, resulting in a higher frequency (violet) light.

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The de-Broglie wavelength of an electron in the first Bohr orbit is The volume occupied by an atom is greater than the volume of the nucleus by a factor of about For a hydrogen atom, when electron jump from

n

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{n}=1

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\lambda_0

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\lambda_0

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{R_H} = 1.097\,\, \times \,\,{10^7}\,\,m

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