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KVPY Aptitude Test - Stream SA

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Earn 100

In a sample of $H -$ atoms, the electrons de-excite from a level ${}^{'}n^{'}$ to $1$ . 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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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 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.

EASY

KVPY Aptitude Test - Stream SA

IMPORTANT

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.

EASY

KVPY Aptitude Test - Stream SA

IMPORTANT

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}

)

EASY

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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.

EASY

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 3 - Atomic Structure>EXERCISE>Q 50

Determine uncertainity in the position of an electron (mass

= 9.1 \times 10^{- 31} Kg

) moving with a velocity

300 m . \sec^{- 1}

, accurate upto

0.001 % . (h = 6.63 \times 10^{- 34} J - s)

EASY

KVPY Aptitude Test - Stream SA

IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 3 - Atomic Structure>KVPY PROBLEMS (PREVIOUS YEARS)>Q 1

An element which has

2

electrons less than that in

Ne

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KVPY Aptitude Test - Stream SA

IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SA Chemistry>Chapter 3 - Atomic Structure>KVPY PROBLEMS (PREVIOUS YEARS)>Q 2

According to Bohr's theory, the angular momentum of the electron in the ground state of the hydrogen atom is

In a sample of H-atoms, the electrons de-excite from a level n'' to 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.

Important Questions on Atomic Structure

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