Light of frequency 7.21 xx 10^(14) Hz is...

Light of frequency `7.21 xx 10^(14) Hz` is incident on a metal surface. Electrons with a maximum speed of `6.0 xx 10^(5)m//s` are ejected from the surface. What is the threshold frequency for photoemission of electrons?

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`4.73xx10^(14)Hz`

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