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An alpha particle of energy $5 M e V$ is scattered through $180 °$ by a fixed uranium nucleus. The distance of closest approach is of the order of:

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Important Questions on Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom

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12th ICSE

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 3

A hydrogen atom in ground state absorbs

10.2 e V

of energy. The orbital angular momentum of the electron increases by:

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12th ICSE

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 4

The electron potential between a proton and an electron is given by

V = V_{0} \log_{e} \frac{r}{r_{0}}

, where

r_{0}

is a constant. Assuming Bohr's model to be applicable, the variation of

r_{n}

with principal quantum number

n

will be:

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 5

If the atom

{}_{100}F m^{215}

follows Bohr's model and the radius of the

5

th orbit of this atom is

p

times the Bohr radius, then the value of

p

is:

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12th ICSE

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 6

In which of the following atoms and ions will the radius of the smallest orbit be minimum?

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 7

Suppose an electron is attracted towards the origin by a force

\frac{k}{r}

where

' k'

is a constant and

' r'

is the distance of the electron from the origin. By applying Bohr model to this system, the radius of the

n

th orbital of the electron is found to be

' r_{n}'

and the kinetic energy of the electron to be

' T_{n}'

. Then, which of the following is true?

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 8

Which one of the following atoms and ions have a ground-state energy of

- 54.4 e V

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 9

As per Bohr model, the minimum energy (in

e V

) required to remove an electron from the ground state of

L i^{+ +}

(doubly-ionised

L i

atom) is:

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12th ICSE

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ISC Physics Class 12, Part-2>Chapter 13 - Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 10

If elements with principal quantum number

n > 4

did not exist in nature, the number of possible elements would be:

An alpha particle of energy 5 MeV is scattered through 180° by a fixed uranium nucleus. The distance of closest approach is of the order of:

Important Questions on Atom, Origin of Spectra : Bohr's Theory of Hydrogen Atom

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An alpha particle of energy $5 M e V$ is scattered through $180 °$ by a fixed uranium nucleus. The distance of closest approach is of the order of: