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A photon of wavelength 3310Å falls on a ...

A photon of wavelength 3310Å falls on a photocathode and an electron of energy `3xx10^(-19)J` is ejected. If the wavelength of the incident photon is changed to 5000Å, the energy of the ejected electron is `9.72xx10^(-20)J`. Calculate the value of Planck's constant and threshold wavelength of the photon.

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