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  1. Light from the constellation Virgo is observed to increase in wavelength by 0.4%
  2. In photoelectric emission process from a metal of work function
  3. An object is seen through a simple microscope of focal length 12 cm.
  4. An alternating voltage e=200s in100t is applied to a series combination
  5. Two tuning forks are sounded together and produce 2 beats per second.