Question 5: Explain the difference between laser light and light from an incandescent lamp? ANSWER Differences between laser light and light from an incandescent lamp…
Question 6: Why Bohr extends quantum theory to the structure of atom? ANSWER Rutherford proposed atomic model in 1911. It suggests the electrons are moving…
Question 7: Why 2He4 has larger ionization energy than H? ANSWER Electrons are being removed from the same orbits in the case of helium and…
Question 8: X-rays can emit electron from metal surface and X-rays can be diffracted. Comment. ANSWER X-rays are electromagnetic radiations of a very small wavelength.…
Question 9: Why X-rays have different properties from light even though both originate from the orbital transition of electrons in excited atoms. ANSWER Although both…
Question 10: What is meant by the statement that a laser beam is coherent, monochromatic and parallel? ANSWER Lasers are Coherent When we say a…
Question 11: What are laser knives? ANSWER Laser beam is coherent and directed in one direction in parallel. As such high energy density (concentrated energy)…
Question 12: Why we cannot see an atom? ANSWER We cannot see an atom because it is too small to be seen by visible light.…
Question 13: What is meant by braking radiation? ANSWER Consider an X-rays tube. Let a fast moving electron moving towards the target. This electron interacts…
Question 14: What is optical pumping? ANSWER Optical pumping is the process in which atoms of a substance in the ground state E1are raised to…