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Light of frequency 7.21 x 10^(14)Hz (Her...

Light of frequency `7.21 x 10^(14)Hz` (Hertz) is incident on a metal surface. Electrons with a maximum speed if `6.0 xx 10^5ms^(-1)` (metre per second) are ejected from the surface. What is the threshold frequency fro photo emission of electrons?
Given `rarr` h(Planck constant) = `6.63 xx 10^(-34) Js`(Joule Second)
`m_e` (mass of electron)=`9.1 xx 10^(-31)` kg (kilogram)

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