
In 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 m2 s-1, Mass of electron, em = 9.1 x 10-31 kg).

Important Questions on Structure of Atom

An accelerated electron has a speed of with an uncertainty of . The uncertainty in finding its location while in motion is .
The value of is __________. (Nearest integer)
[Use mass of electron,






(Where Bohr radius ) is____ (Nearest integer) (Given : Mass of electron , Planck's constant )


(I) An electron in molecule
(II) A hydrogen atom in a , molecule
(III) A proton in the carbon nucleus
(IV) A molecule within a nanotube



If the uncertainty in velocity and position of a minute particle in space are, and respectively. The mass of the particle in is___(Nearest integer)
(Given : )

If a cricket ball of weight has an uncertainty of in its velocity, then the uncertainty in the position of the cricket ball is




A ball weighing is moving with a velocity of If the uncertainty in its velocity is , then the uncertainty in its position is _ (Rounded off to the nearest integer)
[Given: ]

) It is impossible to detemine exact position and exact momentum of an electron simultaneously.
) It is applicable to even macroscopic objects.
) It is possible to detemine the exact position and momentum of an electron simultaneously.
) It is impossible to determine the exact position and momentum of macroscopic object simultaneously.


