The rest mass of a proton is 1.673 x 10-27 kg and that of the electron is 9.109 x 10-31 kg. What must be the speed of the proton which has the same de Broglie wavelength as an electron moving with a speed of 9 x 106 m/s?

(A) 3600 m/s

(B) 4900 m/s

(C) 4300 m/s

(D) 5600 m/s

Concept Questions :-

EMT Radiation
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Which one of the following statement is not true about the quantum numbers n, l, m and s

(A) m gives the information on the energy of the electron in a given orbital.

(B) l gives an idea of the shape of the orbital.

(C) n gives information on the size of the orbital.

(D) s gives the direction of spin of the electron in the orbital.

Concept Questions :-

Quantum Numbers
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The number of electrons in the valence shell of calcium is 

(A) 6

(B) 8

(C) 2

(D) 4

Concept Questions :-

Number of E/P/N
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The brackett series of spectral lines arise when an electron in an excited hydrogen atom jumps from an energy level

(A) n=5 to n=1

(B) n=5 to n=3

(C) n=5 to n=4

(D) n=5 to n=2

Concept Questions :-

Hydrogen Spectra
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What is the ratio of the time period of revolution of electron He+ ion sample in the orbit where the path length is three time the de-broglies wavelength to the time period of revolution in the ground state –

(A) 27:1

(B) 1:27

(C) 9:8

(D) 8:9

Concept Questions :-

de Broglie Equation
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The ratio of the wavelengths of last lines of Balmer and Lyman series is-

(A) 4:1

(B) 27:5

(C) 3:1

(D) 9:4

 

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According to Moseley, a straight line graph is obtained on plotting-

(A) The frequencies of characteristic X-rays of elements against their atomic numbers.

(B) The square of the frequencies of characteristic X-rays of elements against their atomic numbers

(C) The square root of the frequencies of characteristic X-rays of elements against their atomic numbers

(D) The reciprocal of the frequencies of characteristic X-rays of elements against their atomic numbers.

Concept Questions :-

introduction
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The energy of the emitted photon when an electron in Be3+ ion returns from n=2 level to ground state is -

(A) 2.616 x 10-17J

(B) 26.16 x 10-17J

(C) 261.6 x 10-17J

(D) 2616 x 10-17J

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The accelerating potential to be imparted to a beam of electrons to give an effective wavelength of 2.42 nm is 

(A) 2.56V

(B) 3.42V

(C) 0.256V

(D) 0.342V

Concept Questions :-

EMT Radiation
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The splitting of spectral lines in a magnetic field, arising out of orbital motion of electrons only and the further splitting due to spin motion are respectively called

(A) Zeeman and Stark effects

(B) Zeeman and anomalous Zeeman effects

(C) Stark and Zeeman effects

(D) Zeeman and Kerr effects

Concept Questions :-

Type of Spectra
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