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  1. The Rutherford scattering experiment proves that an atom consists of
  2. The velocity of radio-waves is 3×10⁵ km/s. The frequency corresponding to wavelength
  3. Core of electromagnets are made of ferromagnetic material which has
  4. Two particles are oscillating along the same line with the same frequency
  5. When a Daniel cell is connected in the secondary circuit of a potentiometer,