An electron moving at a velocity 100 m/s.what is its wavelength?
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wavelength = v/f f is the frequency
frequency = E/h E is energy , h is planck's constant
wavelength = vh/E
E = mv²
wavelength = h/mv
= 6.626×10^-34/9.1×10^-31×100
= 0.728×10^-5 m
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