The energy of second Bohr orbit of the hydrogen atom is –328 kJ mol–1; hence the energy of fourth Bohr orbit would be
–41 kJ mol–1
–1312 kJ mol–1
–164 kJ mol–1
–82 kJ mol–1
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The de-Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 meters per second is approximately