Assuming that the smallest measurable wavelength in an experiment is 0.570 fm (femtometers), what is the maximum mass of an object traveling at 647 m·s–1 for which the de Broglie wavelength is observable?
De Broglie wavelength l,
l = h/mv
with,
v = 647 ms-1
m = mass of object
h = planck's constant
l = 0.570 fm = 0.570 x 10^-15 m
we get,
mass of object allowed m = 6.626 x 10^-34/0.570 x 10^-15 x 647
= 1.80 x 10^-21 kg
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