An electron, practically at rest, is initially accelerated through a potential difference of 100 volts. It then has a de Broglie wavelength=λ1Å. It then get retarded through 19 volts and then it has wavelength λ2 Å. A further retardation through 32 volts changes the wavelength to λ3.

What is (λ3-λ2)/λ1?

(A) 20/41

(B) 10/63

(C) 20/63

(D) 10/41

Concept Questions :-

de Broglie Equation
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Which of the following has the maximum number of  unpaired electons-

(A) Mg2+

(B) Ti3+

(C) V3+

(D) Fe2+

Concept Questions :-

Number of E/P/N
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There are three energy levels in an atom. How many spectral lines are possible in its emission spectra?

(A) One

(B) Two

(C) Three

(D) Four

Concept Questions :-

Type of Spectra
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Azimuthal quantum number defines -

(A) e/m ratio of electron

(B) Spin of electron

(C) Angular momentum of electron

(D) Magnetic momentum of electron

Concept Questions :-

Quantum Numbers
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For the energy levels in an atom, which one of the following statements is correct -

(A) There are seven principal electron energy levels

(B) The second principal energy level can have four ‘sub energy levels and contains a maximum of eight electrons

(C) The energy level can have maximum of 32 electrons

(D) The 4s sub-energy level is at a higher energy than the 3d sub-energy level

Concept Questions :-

Hydrogen Spectra
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Arrange the following particles in increasing order of values of e/m ratio: Electron(e), proton(p), neutron(n) and α-particle(α)

(A) n,p,e,α

(B) n,α,p,e

(C) n,p,α,e

(D) e,p,n,α

Concept Questions :-

introduction
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The increasing order of energy of electromagnetic radiation can be represented as

(A) microwave < infrared < visible < X-ray

(B) X-ray < visible < infrared < microwave

(C) microwave < infrared < visible < radiowaves

(D) X-ray < infrared < visible < microwave

Concept Questions :-

EMT Radiation
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The wavelength of the photoelectric threshold of a metal is 230 nm. Determine the K.E. of photoelectron ejected from the surface by UV radiation emitted from the second longest wavelength transition (downward) of electron in Lyman series of the atomic spectrum of hydrogen. (R=1.09677 x 107 m-1)

(A) 0.074 x 10-16 J

(B) 1.074 x 10-18J

(C) 6.213 × 10-18 J

(D) 7.123 x 10-10J

 

 

Concept Questions :-

Hydrogen Spectra
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Beryllium's fourth electron will have the four quantum numbers :

                         n               l               m             s

(A)                    1               0                0             1/2

(B)                    1               1                1             1/2

(C)                    2               0                0             -1/2

(D)                    2               1                 0             +1/2

Concept Questions :-

Quantum Numbers
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Mass of neutron is ........................times the mass of electron-

(A) 1840

(B) 1480

(C) 2000

(D) None

Concept Questions :-

introduction
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