Atoms and Nuclei (NEET Physics): Questions 11 - 15 of 67

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Question number: 11

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

Consider a hydrogen like atom whose energy in n th excited state is given by En=13.6Z2n2 when this excited atom makes a transition from excited state to ground state, most energetic photons have energy E max = 52.224 eV and least energetic photons have energy E min =1224 eV. The atomic number of atom is,

Choices

Choice (4) Response

a.

5

b.

2

c.

4

d.

None of the above

Question number: 12

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

If m is mass of electron, v its velocity, r the radius of stationary circular orbit around a nucleus with charge Ze, then from Bohr’s first postulate, the kinetic energy K=12mv2 of the electron in C. G. S system is equal to.

Choices

Choice (4) Response

a.

12Ze2r2

b.

Zer2

c.

Ze2r

d.

12Ze2r

Question number: 13

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

The energy of electron in the n th orbit of hydrogen atom is expressed as En=13.6n2eV wavelength of Lyman series will be

Choices

Choice (4) Response

a.

910 Å, 1213 Å

b.

1315 Å , 1530 Å

c.

5463 Å, 7858 Å

d.

None of the above

Question number: 14

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

In the following atoms and molecule for the transition from n = 2 to n = 1, the spectral line of minimum wavelength will be produced by,

Choices

Choice (4) Response

a.

Di-ionized lithium

b.

Hydrogen atom

c.

Uni-ionized helium

d.

Deuterium atom

Question number: 15

» Atoms and Nuclei » Energy Levels

MCQ▾

Question

Energy levels A, B, C of a certain atom corresponding to increasing values of energy E A < E B < E C. If λ 1, λ 2, λ 3 are the wavelengths of radiations corresponding to the transitions C to B, B to A and C to A respectively, which of the following statements is correct?

 Energy Levels of certain atom

Energy Levels of Certain Atom

Energy levels A, B, C of a certain atom corresponding to increasing values of energy EA < EB < EC. λ1, λ2, λ3 are the wavelengths of radiations corresponding to the transitions C to B, B to A and C to A respectively.

Choices

Choice (4) Response

a.

λ32=λ12+λ22

b.

λ1+λ2+λ3=0

c.

λ3=λ1λ2λ1+λ2

d.

λ3=λ1+λ2

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