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  1. A plane wave of wavelength 6250Å is incident normally on a slit of width 2×10⁻² cm.
  2. A bubble is rising from bottom of a lake. The volume of bubble becomes
  3. Two spheres A and B of masses m and m respectively collide. A is at rest initially
  4. The mean radius of the earth is R, its angular speed on its own axis is ?
  5. The unit of thermal conductivity is