# Calculate the de Broglie wavelength for each of the following. a.)

Calculate the de Broglie wavelength for each of the following.
a.) an electron with a velocity 50.% of the speed of light
b.) a tennis ball (55 g) served at 45 m/s (~100 mi/h)
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enlacamig
a) the formula for the debroglie wavelength of an electron is as shown below.
$\lambda =\frac{h}{mv}$

here m = mass of electron
v = velocity
since we have given v = 50% of c i.e speed of light
hence $v=0.5×3×{10}^{8}=1.5×{10}^{8}$ approximately.
Hence substituting the values we get

b) using the above formula for
m = 55gm = 0.055 kg
and v = 45m/sec
we get