Chapter 20 - Atomic Spectra - 9

Physics Class 12
1. Roentgen discovered the X-Rays in 1885.

2. The radius of the hydrogen atom is about 5x10-11m.

3. A population inversion is that state in which the higher energy has a greater population than the lower energy state.

4. In Helium-Neon Laser discharge tube is filled with 80% helium and 20% neon gas.

5. Laser beams are used as surgical tool for welding detached retina.

6. The stimulated emission in an atom was first pointed out by Einstein.

7. Ruby Laser is an example of solid Laser

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