MEDICAL ENTRANCE TIPS

24. e/m values of electrons, protrons, neutrons and a particles,
neutron < alpha particles < proton < electron
25. First atom model (plum-pudding model) was proposed by J.J. Thomson.
26. Nuclear model of atom was proposed by Rutherford.
27. Corpuscular nature of light was proposed by Issac Newton.
28. Wave nature of light was proposed by Christian Huygens.
29. A seientiest who got Nobel Prize for proving frequency dependence of photoelectric effect is Albert Einstein.
30. Einstien equation for photo electric emission ;
hr = 1/2 mv2 + w
31. Compton effect : The scattered x-rays have lower frequency ie Lower energy than the incident rays.
32. Dual nature of light was proposed by Albert Einstein
33. Photoelectric effect, compton effect, blackbody radiation, reflection and refraction of light illustrates
particle character.
34. Diffraction and interference of light shows wave character.
35. 1 Angstrom = 10-8 cm = 10-10 m
1 nm = 10-9 m = 10 Angstrom.
36. Unit of frequency - Hertz or cycles / second
37. g = c / l
38. Wave number (g) = 1/l or g = g/c c = 3.8 X 108 m/s
39. Plancks equation E = hg
h = 6.63 X 10-34 J.S.
40. Emission Spectrum was studied by Bunsen and kirchoff
41. The different regions of electromagnetic spectrum in the order of increasing frequency
Radiowaves, microwaves, IR, Visible, uv, x-rays, gamma rays
42. X- rays (Rontgen) were produced if cathode rays were allowed to strike certain metals (anticathode).
X - rays are not deflected by electric and magnetic fields.
44. Rydberg’s formula (Ritz-combination Principle)