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  1. The frequency of fundamental tone in an open organ pipe of length
  2. A metal rod of length l cuts across a uniform magnetic field B with a velocity v.
  3. A stone is tied to a string of length l and whirled in a vertical circle with the other end
  4. In a radioactive decay process, the negatively charged emitted β- particles are
  5. An electron in potentiometer experiences a force 2.4×10⁻¹⁹N. The length of potentiometer