Uncertainty Principle

IMPORTANT

Uncertainty Principle: Overview

This topic covers concepts, such as Heisenberg Uncertainty Principle, Significance of Heisenberg Uncertainty Principle, and Uncertainty Principle for Energy and Time.

Important Questions on Uncertainty Principle

EASY
IMPORTANT

The measurement of the electron position if associated with an uncertainty in momentum which is equal to 1× 10 18 gcm s 1 . The uncertainty in electron velocity is,

(mass of an electron is   9× 10 28 g )

                                                                                                                                                                                                                               

MEDIUM
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If uncertainty in position and momentum are equal, then uncertainty in velocity is :

                                                                                                                                                                                                                               

EASY
IMPORTANT

Given : The mass of electron is  9.11×1031kg, Planck constant is  6.626×1034Js, the uncertainty involved in the measurement of velocity within a distance of   0.1Å is

                                                                                                                                                                                                                               

MEDIUM
IMPORTANT

The position of both, an electron and a helium atom is known within 1.0 nm. Further, the momentum of the electron is known with in 5.0×1026kgms1.The minimum uncertainty in the measurement of the momentum of the helium atom is

HARD
IMPORTANT

The position of both, an electron and a helium atom is known within 1.0 nm. Further the momentum of the electron is known within    5.0× 10 26 kgm s 1 .  The minimum uncertainty in the measurement of the momentum of the helium atom is

                                                                                                                                                                                                                               

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IMPORTANT

The exact path of electron in any orbital camot be determined. The above statement is based on         

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IMPORTANT

Calculate the mass of an elementary particle, which is accelerated to twice the velocity of light with the precision ±1% and has 1.05×10-13 m uncertainty in position. h=6.6×10-34 kg m2 s-1

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If the uncertainty in momentum and uncertainty in the position of a particle are equal, then the uncertainty in its velocity would be given by _____

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Find the uncertainty in the position of an electron which is moving with a velocity of 2.99x104 cm·s-1, accurate up to 0.0016%. (Given, me=9.1×10-28 g,h=6.626×10-27erg.s

HARD
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If a proton is accelerated to a velocity of 3×107 m·s-1 which is accurate up to ±0.5%, then the uncertainty in its position will be [mass of proton =1.66×10-27 kg,h=6.6×10-34 J.s

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If the position of the electron is measured within an accuracy of ±0.002 nm. What is the uncertainty in the momentum of the electron.

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What is the uncertainty in position of an electron if uncertainty in its velocity is 0.001%. Planck's constant h=6.62×10-34 Js.

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IMPORTANT

The uncertainty in the position and velocity of a particle are 10-10 m and 5.27 x 10-24 ms-1 respectively. What is the mass of the particle. (h=6.625 x 10-34 Js).

EASY
IMPORTANT

According to Heisenberg uncertainty principle, which two quantities cannot be accuracy measured together at the same instant of time?

EASY
IMPORTANT

According to Heisenberg uncertainty principle, which two quantities cannot be accuracy measured together at the same instant of time?

HARD
IMPORTANT

Given: The mass of electron is 9.11×10-31 kg, Planck constant is 6.626×10-34 J, the uncertainty involved in the measurement of velocity within a distance of 0.1 A° is

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IMPORTANT

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 10-3 4 kg m2 s-1 , mass of electron, me = 9.1 x 10-31  kg)

MEDIUM
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Given: The mass of electron is 9.11×10-31kg, Planck constant is 6.626×10-34J, the uncertainty involved in the measurement of velocity within a distance of 0.1Ao is

HARD
IMPORTANT

If a third flying dust particle of mass 1 mg had the same uncertainty in position as in its velocity, the uncertainty in its momentum would be

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IMPORTANT

The uncertainty in the velocity of the heavier dust particle as compared to the lighter dust particle is