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  1. The focal length of the objective of a terrestrial telescope is 80 cm
  2. Find out the e.m.f. produced when the current changes from 0 to 1 A in 10 sec.
  3. In a water fall, the water falls from a height of 100 m. If the entire kinetic energy
  4. A particle of mass 1mg has the same wavelength as an electron moving with a velocity
  5. Light of wavelength 500 nm is incident on a metal with work function 2.28 eV.