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Physics
The de-Broglie wavelength of a ball of mass 120 g moving at a speed of 20 m/s is
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Q. The de-Broglie wavelength of a ball of mass $ 120\, g $ moving at a speed of $ 20\,m/s $ is
AMU
AMU 2010
Dual Nature of Radiation and Matter
A
$ 3.5 \times 10^{-34}\,m $
9%
B
$ 2.8 \times 10^{-34}\,m $
82%
C
$ 1.2 \times 10^{-34}\,m $
0%
D
$ 2.1 \times 10^{-34}\,m $
9%
Solution:
de-Broglie wavelength, $\lambda=\frac{h}{mv}$
$=\frac{6.6\times10^{-34}}{120\times10^{-3}\times20}$
$=2.75\times10^{-34}\,m$