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Can someone help me with part A. Its given "the velocity of an electron is emitted from a metal surface by a photon is 3.6 x 10^3 km * s^-1 and are trying to find the wavelength of the ejected electron" Im having a hard time figuring out what equations to use or the steps to solving it. Thanks!
Use the DeBroglie wavelength equation and plug into the numerator Planck's constant. In the denominator you can multiply the mass of an electron (9.11x10^-31 kg) by the velocity which is 3.6x10^6 ms-1. This should give you the desired answer of 2.02 x 10^-10 meters.
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