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  1. A vibration magnetometer placed in magnetic meridian has a small bar magnet
  2. If the minimum energy of photons needed to produce photoelectrons is 3 eV,
  3. The binding energy of deutron is 2.2 MeV and that of ₂⁴He is 28 MeV.
  4. The Davisson- Germer experiment is the direct evidence of
  5. A beam of light of wavelength 600 nm from a distant source falls