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  1. When photons of energy hν fall on an aluminium plate (of work function E₀),
  2. A tuning fork of frequency x produces 4 beats with a source of 256 Hz and 8 beats
  3. According to Hook’s law, force is proportional to
  4. A block of 2 kg is kept on the floor. The coefficient of static friction is 0.4
  5. The effective length of magnet is 31.4 cm and its pole strength is 0.8Am.