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Determine the Planck's constant h if pho...

Determine the Planck's constant h if photoelectrons emitted from a surface of a certain metal by light of frequency `2.2 xx 10^(15)`Hz are fully retarted by a reverse potential of 6.6 V and those ejected by light of frequency `4.6 xx 10^(15)` Hz by a reverse potential of `16.5 eV`.

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