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  1. A light whose frequency is equal to 6.0 x 10¹⁴ Hz is incident on a metal
  2. The kinetic energy of an electron in the first excited state is
  3. Electrons of mass m with de-Broglie wavelength λ fall on the target in an X-ray tube.
  4. If the length of a closed organ pipe is 1.5 m and velocity of sound is 330 m/s,
  5. A thin film of soap solution (n=1.4) lies on the top of a glass plate (n=1.5).