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  1. If the unit of force and length are doubled, then unit of energy will be
  2. Van der waals,equation of state is(p+a/v²)(V-b)=nRT. The dimensions of a and b
  3. A plane wave of wavelength 6250Å is incident normally on a slit of width 2×10⁻² cm.
  4. At what temperature will the rms speed of air molecules be double that of NTP?
  5. Two radiations of photons energies 1 eV and 2.5 eV, successively