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Consider a neutron (mass m) of kinetic energy E and a photon of the same energy. Let λn and λp be the de Broglie wavelength of neutron and the wavelength of photon respectively. Obtain an expression for λn/λp.
The minimum intensity of white light that our eyes can perceive is about 0.1 nWm⁻². Calculate the number of photons of this light entering our pupil (area 0.4 cm²) per second.
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