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Light of frequency 7.21×1014Hz is incident on a metal surface . Electron with a maximum speed of 6.0×105ms1 are ejected from the surface. What is the threshold frequency for photo emission of electron ? h=6.63×1034Js,me=9.1×1031kg

4.74×1015Hz4.74×1015KHz4.74×1014Hz4.74×1014kHz

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