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  1. The work function of a substance is 4.0 eV. The longest wavelength of light
  2. A projectile is fired from the surface of the earth with a velocity of 5 m s⁻¹ and angle
  3. Characteristic X-rays are produced due to
  4. An alpha nucleus of energy 1/2 mv² bombards a heavy nuclear target of charge Ze
  5. A solid body rotates about a stationary axis, so that its angular velocity