# The De-Brogile wavelength of a tennis ball mass 60g moving with a velocity of 10m per second is approximately

$(a)\;10^{-16}m\qquad(b)\;10^{-25}m\qquad(c)\;10^{-33}m\qquad(d)\;10^{-31}m$

$\lambda=\large\frac{h}{mu}$
$\Rightarrow \large\frac{6.626\times 10^{-34}}{60\times 10^{-3}\times 10}$
$\Rightarrow 10^{-33}$
Hence (c) is the correct answer.