A) \[50\,kg\,m{{s}^{-1}}\]
B) \[80\,kg\,m{{s}^{-1}}\]
C) \[80\times {{10}^{-26}}\,kg\,m{{s}^{-1}}\]
D) \[5.0\times {{10}^{-26}}\,kg\,m{{s}^{-1}}\]
Correct Answer: B
Solution :
By Heisenberg uncertainty principle \[\Delta x\times \Delta p\ge \frac{h}{4\pi }\] when the position of electron and helium atoms is known and momentum of electron is also known within a range, therefore the momentum of helium atom is equal to the momentum of electron i.e., \[5\times {{10}^{-26}}\,kg\,m{{s}^{-1}}\]
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