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When ultraviolet rays of wavelength 620 Å is incident on a hydrogen atom in the ground state, its electron is emitted with a velocity of `1.5 xx10^(6) m *s^(-1)` . What is the ionisation energy of hydrogen ? Given , h=`6.625xx10^(-34)J *s` , mass of electron =`9.1 xx 10^(-31)kg, c=3xx 10^(8)m*s^(-1) and 1 eV=1.6xx 10^(-19)J`.

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13.6 eV
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