Chemistry · JEE

Important Questions: Dual nature of matter, de Broglie's relationship, Heisenberg uncertainty principle for JEE

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Part of Atomic Structure in JEE Main Chemistry.

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Q1ChemistryUnit 2: Atomic Structure

Uncertainity in position of a particle of

25 \mathrm{g}

in space is

10^{-15} \mathrm{m} .

Determine uncertainity in velocity

\left(\mathrm{m} \mathrm{sec}^{-1}\right)

in it. (plank's constant,

\boldsymbol{h}=\mathbf{6 . 6} \times \mathbf{1 0}^{-\mathbf{3 4}} \mathbf{J s}

)

Q2ChemistryUnit 2: Atomic Structure

An electron in

H

-atom in ground state absorbs 1.5 times as much energy as the minimum required for its escape (i.e.,

13.6 e V)

from the atom. Calculate the wavelength of emitted electron.

Q3ChemistryUnit 2: Atomic Structure

Assertion According to de Broglie, the wavelengths associtated with electrons and other subatomic particles can be detected experimentally. Reason The wavelength associated with any material particle is directly proportional to its mass.

Q4ChemistryUnit 2: Atomic Structure

If the following matter waves travel with equal velocity, the longest wavelength is that of a/an:

Q5ChemistryUnit 2: Atomic Structure

If the kinetic energy of a particles is reduced to half, de broglie wave length becomes:

Q6ChemistryUnit 2: Atomic Structure

The uncertainty in position of an electron

\left(\boldsymbol{m}=\mathbf{9 . 1} \times \mathbf{1 0}^{-\mathbf{2 8}} \mathbf{g m}\right)

moving with a velocity

3 \times 10^{4} \mathrm{cm} / \mathrm{s}

accurate upto

0.001 \%

will be:

Q7ChemistryUnit 2: Atomic Structure

The wave length of an electron wave is inversely proportional to and

Q8ChemistryUnit 2: Atomic Structure

The uncertainty (in meters) in the position of an insect weighing

0.68 g

and traveling at a velocity of

0.85 \mathrm{m} / \mathrm{s}

(the uncertainty in the velocity is 0.1

m / s),

is:

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