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  1. A certain metallic surface is illuminated with monochromatic light of wavelength
  2. If λ₁ and λ₂ are the wavelengths of the first members of the Lyman and Paschen
  3. A light emitting diode(LED) has a voltage drop of 2 volt across it
  4. Two planets at mean distances d₁ and d₂ from the sun have their frequencies n₁ and n₂
  5. When you move from equator to pole, the value of acceleration due to gravity (g)