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  1. The wavelength of kα, X-rays produced by an X-ray tube 0.76Å. The atomic number
  2. If λ₁ and λ₂ are the wavelengths of the first members of the Lyman and Paschen
  3. In one dimensionsal motion,instantaneous speed v statisfies 0⦤v⦤vₒ
  4. A p-n-p transistor is used in common emitter mode in an amplifier circuit.
  5. A point charge q is placed at a distance x/2 directly above the centre of a cube