(b) Light with a wavelength of 2.50 * 10-7 m falls on a piece of chromium in an evacuated glass tube. What is the minimum de Broglie wavelength of the emitted elec-trons? (Note that the energy of the incident light must be conserved; that is, the photon’s energy must equal the sum of the energy needed to eject the electron plus the kinetic energy of the electron.)
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Master De Broglie Wavelength with a bite sized video explanation from Jules Bruno