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The work function for a metal is 1.8eV. ...

The work function for a metal is 1.8eV. Light of 5000Å is incident on it. Calculate (a) threshold frequency and threshold wavelength, (b) maximum kinetic energy of the emitted electrons, (c) maximum velocity of the emitted electrons, (d) if the intensity of the incident light be doubled, then what will be the maximum kinetic energy of the emitted electrons? given, `h=6.63xx10^(-34)Js, m_e=9xx10^(-31)kg, c=3xx10^8ms^-1.`

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