Modern Physics - Graduate level important notes for competitive exams - PART2

  •  4n series is called as "Thorium" series.
  • 4n+1 series is called as "Neptunium" series.
  • 4n+2 series is called as "Uranium" series
  • 4n+3 series is called as "Actinium" series
  • X-rays & 𝛾-rays of same energies are distinguished by their frequencies
  • Spin of a Deuteron  is 1.
  • Spin of Muons is 1/2.
  • Spin of Pions (π-mesons) is zero.
  • Spin of Photon is 1.
  • Spin of Graviton is 2.
  • Mass of a Proton is 1.0072766 amu
  • Mass of a Neutron is 1.0086654 amu
  • The total quantum number 'n' specified "Energy" quantization.
  • The azimuthal quantum number specified "Angular Momentum".
  • The magnetic moment of proton is given by 2.8eħ/2mp
  • The magnetic moment of Neutron is given by 1.9eħ/2mp.
  • In Davisson-Germer experiment , the angle between incident beam and diffracted beam is called "co-lattitude".
  • In heavy atoms the spin-orbit interaction is almost equal to "electrostatic interaction".
  • L-S coupling is due to "electrostatic interaction".
  • L-S coupling scheme breaks down in strong magnetic field and applies to light atoms.
  • In light atoms, "orbit interaction" is less than "electrostatic interaction".
  • According to shell model nucleons interact primarily with a general force field rather than directly with one another.
  • Magic numbers: 2,8,20,28,50,82,126
  • Debroglie wavelength associated with electron accelerated to a potential V is ƛ=12.26/√V A⁰

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