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  1. A ray enters a glass sphere of refractive index μ=√3 at an angle of incidence of 60⁰
  2. A nucleus of uranium decays at rest into nuclei of thrrium and helium. Then
  3. In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series
  4. A straight conductor 0.1 m long moves in a uniform magnetic field 0.1 T.
  5. A uranium nucleus ₉₂ U ²³⁸ emits an α-particle and a β-particle in succession.