| S.No | Question |
| Question 1 | Why does the spectrum of hydrogen consists of many lines even though hydrogen atom has a single electron? See Answer |
| Question 2 | Suppose 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? See Answer |
| Question 3 | Can 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. See Answer |
| Question 4 | Why do solids give rise to continuous spectrum while hot gases to line spectrum? See Answer |
| Question 5 | Explain the difference between the laser light and light from an incandescent lamp? See Answer |
| Question 6 | Why Bohr extended quantum theory to the structure of atom? See Answer |
| Question 7 | Why 2He4 has larger ionization energy than H? See Answer |
| Question 8 | X-rays can emit electrons from metal surface and X-rays can be diffracted. Comment. See Answer |
| Question 9 | Why X-rays have different properties from light even though both originate from the orbital transition of electrons in excited atoms? See Answer |
| Question 10 | What is meant by the statement that a laser beam is coherent, monochromatic and parallel? See Answer |
| Question 11 | What are laser knives? See Answer |
| Question 12 | Why we cannot see an atom? See Answer |
| Question 13 | What is meant by braking radiations? See Answer |
| Question 14 | What is optical pumping? See Answer |
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