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  1. A projectile is thrown in the upward direction making an angle of 60°with the horizontal
  2. The photoelectric threshold frequency of a metal is ν. When light of frequency 4ν
  3. The identical loops of copper and aluminium are moving with the same speed
  4. A 220 volts input is supplied to a transformer. The output circuit draws
  5. For photoelectric emission from certain metal the cut-off frequency is v