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  1. A mixture consists of two radioactive materials A₁ and A₂ with half lives of 20s
  2. The refractive index of water, glass and diamond are 1.33, 1.50, 2.40 respectively
  3. When npn transistor is used as an amplifier
  4. Astigmatism is corrected by using
  5. what is the de-Broglie wavelength of the electron accelerated through a potential