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IMPORTANT

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In Bohr's model of the hydrogen atom, determine the ratio between the period of revolution of an electron in the orbit of $n = 1$ to the period of the revolution of the electron in the orbit $n = 2$ .

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Important Questions on Atomic Structure

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KVPY Aptitude Test - Stream SA

IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 3 - Atomic Structure>EXERCISE>Q 42

If first ionisation potential of an atom is $16 V,$ determine the first excitation potential value in Volts for it.

Give an integer as the answer.

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 3 - Atomic Structure>EXERCISE>Q 43

Photon having energy equivalent to the binding energy of

4 th

state of

{He}^{+}

atom is used to eject an electron from the metal surface of work function

1.4 eV

. If the electrons are further accelerated through the potential difference of

4 V

, then, the minimum value of de-Broglie wavelength in cm associated with the electron is found to be

5 \times 10^{- p} cm . Evaluate p ?

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 3 - Atomic Structure>EXERCISE>Q 44

In a sample of

H -

atoms, the electrons de-excite from a level

{}^{'}n^{'}

1

. The total number of lines belonging to the Balmer series are two. If the electrons are ionised from the level

{}^{'}n^{'}

by the photons of energy

13 eV

, then determine the kinetic energy of the ejected photoelectrons.

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 3 - Atomic Structure>EXERCISE>Q 45

α -

particle has an initial kinetic energy of

25 eV

, and it is accelerated through the potential difference of

150

volts. If a proton has the initial kinetic energy of

25 eV

, and it is accelerated through the potential difference of

25

volts, then find the approximate ratio of the final wavelengths associated with the proton and the

α -

particle.

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 3 - Atomic Structure>EXERCISE>Q 46

Uncertainty in position of a particle of

25 g

in space is

10^{- 15} m

. Determine, uncertainty in velocity

(m . \sec^{- 1})

in it. (Plank's constant,

h = 6.6 \times 10^{- 34} Js

) If answer is

2.1 \times 10^{- x}

. then x is.

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 3 - Atomic Structure>EXERCISE>Q 47

The orbital angular momentum for an electron revolving in an orbit is given by

\sqrt{ℓ (ℓ + 1)} \frac{h}{2 π}

. Determine this momentum for an

s

-electron.

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KVPY Aptitude Test - Stream SA

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 3 - Atomic Structure>EXERCISE>Q 48

Determine the wavelength of the radiation emitted, when in a hydrogen atom, the electron falls from infinity to the stationary state

1

. (Rydberg constant

= 1.097 \times 10^{7} m^{- 1}

)

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Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 3 - Atomic Structure>EXERCISE>Q 49

Consider the ground state of the

Cr

atom

(Z = 24)

. Determine the number of electrons with the azimuthal quantum numbers,

ℓ = 1

and

2

, respectively.

In Bohr's model of the hydrogen atom, determine the ratio between the period of revolution of an electron in the orbit of n=1 to the period of the revolution of the electron in the orbit n=2.

Important Questions on Atomic Structure

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In Bohr's model of the hydrogen atom, determine the ratio between the period of revolution of an electron in the orbit of $n = 1$ to the period of the revolution of the electron in the orbit $n = 2$ .