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In an atom, two electrons move around the nucleus in circular orbits of radii $R$ and $4 R$ . The ratio of the times taken by them to complete one revolution is

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Important Questions on Atoms, Molecules and Nuclei

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Critical Thinking>Q 6

A particle of charge

q

mass

v

is moving with constant speed

v

and perpendicular to a constant magnetic field

B

follows circular path. If the angular momentum about the Centre of this circle is quantized so that

m v r = n \frac{h}{2 π}

, then the allowed radii for the particle are given by,

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Critical Thinking>Q 7

The radius of hydrogen atom in its ground state is

5.3 \times 10^{- 11} m

. After collision with an electron, it is found to have a radius of

13.25 \times 10^{- 10} m

. The principal quantum number

n

of the final state of the atom is

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Critical Thinking>Q 8

When the electron in hydrogen atom is excited from the

4^{th}

stationary orbit to the to

5^{th}

stationary orbit, the change in the angular momentum of the electron in joule-second is

(h = 6.64 \times 10^{- 34} J s)

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Critical Thinking>Q 9

A ground state hydrogen atom has an energy of

- 13.6 eV

n = 3

. If the electron is excited to the third energy state, its energy becomes,

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Critical Thinking>Q 11

Energy in a Bohr's orbit is given to be equal to

\frac{B}{n^{2}}

with

B = 16 \times 10^{- 18} J

. The wavelength of the radiation, when the electron jumps from fourth orbit to second orbit is

(c = 3 \times 10^{8} m s^{- 1})

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Critical Thinking>Q 12

The series limit wavelength of the Lyman series for the hydrogen atom is given by,

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Critical Thinking>Q 16

The shortest wavelength in hydrogen spectrum of Lyman series when

R_{H} = 109678 {cm}^{- 1}

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 12 - Atoms, Molecules and Nuclei>Critical Thinking>Q 17

The ratio of the frequencies of the long wavelength limits of the Brackett and Pfund series of hydrogen is

In an atom, two electrons move around the nucleus in circular orbits of radii R and 4R. The ratio of the times taken by them to complete one revolution is

Important Questions on Atoms, Molecules and Nuclei

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In an atom, two electrons move around the nucleus in circular orbits of radii $R$ and $4 R$ . The ratio of the times taken by them to complete one revolution is