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  1. A glass flask weighing 390 g having internal volume 500 cc just floats
  2. A tuning fork frequency 512 Hz is vibrated with a sonometer wire and 6 beats per second
  3. In an a.c circuit the e.m.f. (e) and the current (i) at any instant are given
  4. Two identical flutes produce fundamental notes of frequency 300 Hz at 27° C
  5. In an AC circuit the potential differences across an inductance and resistance joined