JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Question Bank Mock Test - Atomic Structure

  • question_answer
    1In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005 %. Certainty with which the position of the electron can be located is (h = 6.6 x \[{{10}^{-34}}\] kg \[{{m}^{2}}\]/s, mass of electron, \[{{e}_{m}}\] = 9.1 x \[{{10}^{31}}\] kg)

    A) \[1.52\times {{10}^{-4}}m\]     

    B) \[5.10\times {{10}^{-3}}m\]

    C) \[1.92\times {{10}^{-3}}m\]     

    D) \[3.84\times {{10}^{-3}}m\]

    Correct Answer: C

    Solution :

    [c] By Heisenberg's uncertainty principle             \[\Delta x(m\Delta V)=\frac{h}{4\pi }\]             \[\Delta {{V}_{acc}}=0.005%\]             Or \[\Delta V=\frac{600\times 0.005}{100}=0.03m{{s}^{-1}}\]             \[\Delta x\times 9.1\times {{10}^{-31}}\times 0.03=\frac{6.6\times {{10}^{-34}}}{4\times 3.14}\]             Hence, \[\Delta x=\frac{6.6\times {{10}^{-34}}}{4\times 3.14\times 0.03\times 9.1\times {{10}^{-31}}}=1.92\times {{10}^{-3}}m\]


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