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  1. The excitation potential of hydrogen atom in the first excited state is
  2. Ratio of the radii of the nuclei with mass numbers 8 and 27 would be
  3. A spring of spring constant 5 x 10³ N/m is stretched initially by 5 cm
  4. If the length of a closed organ pipe is 1.5 m and velocity of sound is 330 m/s,
  5. A tuning fork of frequency x produces 4 beats with a source of 256 Hz and 8 beats