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Light from a helium-neon laser (wavelength=633 nm) is focused through a pinhole prior to illuminating a 1.00 mm diameter aperture. If the pinhole is located 50.0 cm behind the diffracting aperture, how far in front of the aperture should an observing screen be located to give a Fresnel number of ten?
Any help will be appreciated.
An electron with the initial speed of 4.00×10^5 is brought to rest by an electric field. What was the initial kinetic energy of electron, in electron volts.
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