Find the frequency of the light ν which ejects from a metal surface electrons fully retarded by a reverse potential of U = 3 V. The photoeffect begins in this metal at a frequency of incident light of ν0 = 6 × 1014 Hz. Find the work on escaping of an electron from this metal

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Find the frequency of the light ν which ejects from a metal surface electrons fully retarded by a reverse potential of U = 3 V. The photoeffect begins in this metal at a frequency of incident light of ν0 = 6 × 1014 Hz. Find the work on escaping of an electron from this metal.
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