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Uncertainty in position is twice the unc...

Uncertainty in position is twice the uncertainty in momentum. Uncertainty in velocity is :

A

`sqrt((h)/(pi))`

B

`(1)/(2m) sqrt((h)/(pi))`

C

`(1)/(2m)sqrt(h)`

D

`(h)/(4pi)`

Text Solution

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The correct Answer is:
C
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If uncertainty in position is twice the uncertainty in momentum then uncertainty in velocity is

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A german physicist gae a principle about the uncertainties in simultaneous measurement of position and momentum of small particles. According to that physicist. It is impossible to measure simultaneously the position and momentum of small particle with absolute accuracy or certainty. if an attempt is made to measure any one of these two quantities with higher accuracy, the other becomes less accurate. The produce of the uncertainty in position (Deltax) and uncertainty momentum (Delta p) is always constant and is equal to or greater than h//4pi , where h is Planck's constant i.e. (Deltax ) (Deltap) ge (h)/(4pi) If uncertainty in momentum is twice the uncertainty in position of an electron then uncertainty in velocity is: [bar(h)=(h)/(2pi)]

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ALLEN-ATOMIC STRUCTURE-Exercise - 02
  1. Which orbitals is non-directional ?

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  2. A hydrogen-like atom has ground state binding energy 122.4eV. Then :

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  3. Uncertainty in position is twice the uncertainty in momentum. Uncertai...

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  4. For which orbital angular probability distribution is maximum at an an...

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  5. Which orbit would be the first to have g subshell :-

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  6. The decreasing order of energy of the 3d,4s,3p,3s orbital is :-

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  7. If n and l are respectively the principal and azimuthal quantum number...

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  8. If wavelength is equal to the distance travelled by the electron in on...

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  9. According to Schrodinger model nature of electron in an atom is as :-

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  10. Which describes orbital :-

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  11. In order to have the same wavelength for the electron (mass m(e)) and ...

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  12. The quantum number + 1//2 and -1//2 for the electron spin represent

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  13. Which is true about Psi :-

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  14. The circumference of n^(th) orbit in H-atom can be expressed in terms ...

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  15. A particle X moving with a certain velocity has a debroglie wave lengt...

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  16. What are the values of the orbital angular momentum of an electron in ...

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  17. If m = magnetic quantum number and l = azimuthal quantum number then :...

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  18. The number of unpaired electron in Mn^(4+) (Z = 25) is :-

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  19. After np orbitals are filled, the next orbital filled will be :-

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  20. The value of the magnetic moment of a particular ion is 2.83 Bohr magn...

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