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Light of frequency 7.21xx10^(14) Hz is i...

Light of frequency `7.21xx10^(14)` Hz is incident on a metal surface. Electrons with a maximum speed of `6xx10^(5)m" "s^(-1)` are ejected from the surface. The threhold frequency for photoemission of electrons is threshold frequency for photoemission of electrons is
`("Given h"=6.63xx10^(-34)Js,m_(e)=9.1xx10^(-31)kg)`

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