Question

The de-Broglie wavelength of a ball of mass $10\, g$ moving with a velocity of $10\, ms ^{-1}$ is $\left[h=6.626 \times 10^{-34} J s\right]$

• A. $ 6.626\times 10^{-33}\,m $
• B. $ 6.626\times 10^{-29}\,m $
• C. $ 6.626\times 10^{-31}\,m $
• D. $ 6.626\times 10^{-36}\,m $

Answer 1

Answer: (A)

$ m=10\,g=0.01\,kg,\,v=10\,ms^{-1} $
According to de-Broglie equation,
$ \lambda =\frac{h}{mv} $
$ =\frac{6.626\times 10^{-34}}{0.01\times 10} $
$ =6.626\times 10^{-33}\,m $