MerCadTel devices are like digital cameras, but for infrared radiation. a) Suppose you observe an object using a wavelength of 5 microns (5e-6m). What is the energy of these photons? b) If the work function of the MerCadTel substrate (the detector surface) is 0.13eV, what is the kinetic energy of the electron that is liberated from the detector? c) What is the De Broglie wavelength of the liberated electron? The mass of the electron is 9.1e-31kg, 1 eV=1.6e-19 J, and h = 6.626e-34 Js. Hint: The electron is not moving relativistically.

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de Broglie Equation

The sketch of matter waves is drawn below: