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Question 1Why does the spectrum of hydrogen consists of many lines even though hydrogen atom has a single electron?

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Question 2Suppose that the electron in the hydrogen obeyed classical mechanics rather than quantum mechanics. Why would such a hypothetical atom emit a continuous spectrum rather than a line spectrum?

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Question 3Can the electron in the ground state of hydrogen absorb a photon of energy (a) less than 13.6 ev (b) greater than 13.6 ev? Explain.

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Question 4Why do solids give rise to continuous spectrum while hot gases to line spectrum?

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Question 5Explain the difference between the laser light and light from an incandescent lamp?

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Question 6Why Bohr extended quantum theory to the structure of atom?

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Question 7Why 2He4 has larger ionization energy than H?

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Question 8X-rays can emit electrons from metal surface and X-rays can be diffracted. Comment.

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Question 9Why X-rays have different properties from light even though both originate from the orbital transition of electrons in excited atoms?

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Question 10What is meant by the statement that a laser beam is coherent, monochromatic and parallel?

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Question 11What are laser knives?
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Question 12Why we cannot see an atom?

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Question 13What is meant by braking radiations?

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Question 14What is optical pumping?

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