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  1. Photoelectric emision occurs only when the incident light has more than a certain minimum
  2. When a string is divided into three segments of length l₁, l₂ and l₃ the fundamental
  3. Which of the following is not a transverse wave?
  4. An unpolarised beam of intensity I₀ falls on a polaroid. The intensity
  5. A radioactive substance contains 10000 nuclei and its halflife period is 20 days