For the Paschen series the values of n1 and n2 in the e

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431.

For the Paschen series the values of n1 and nin the expression E =Rhc1n12-1n22 are

  • n1= 1, n2 = 2, 3, 4, ...

  • n1= 2, n2 = 3, 4, 5,...

  • n1= 3, n= 4,5,6,...

  • n1= 4, n2 = 5,6,7,...


C.

n1= 3, n= 4,5,6,...

Paschen series is the third series of hydrogen spectrum and lies in the infrared region, therefore for this series, n1 = 3 and n> n1,ie, 4, 5, 6,....


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432.

In Sommerfeld's modification of Bohr's theory, the trajectory of an electron in a hydrogen atom is

  • a perfect ellipse

  • a closed ellipse-like curve, narrower at the perihelion position and flatter at the aphelion position

  • a closed loop on spherical surface

  • a rosette


433.

If a species has 16 protons, 18 electrons and 16 neutrons, find the species and its charge.

  • S1-

  • Si2-

  • P3-

  • S2-


434.

Which of the following expressions gives the de-Broglie relationship?

  • p=hmv

  • λ=hmv

  • λ=hmp

  • λm=vp


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435.

The orbital angular momentum of an electron in 2s orbital is

  • +12h2π

  • zero

  • h2π

  • 2h2π


436.

The number of electron and neturons of an element is 18 and 20 respectively. Its mass number is

  • 2

  • 17

  • 37

  • 38


437.

The number of α and β particles emitted in nuclear reaction Th22890 Bi21283 are respectively

  • 4,1

  • 3,7

  • 8,1

  • 4,7


438.

The radius of hydrogen atom is 0.53 Å. The radius of 3Li2+ is of:

  • 1.27 Å

  • 0.17 Å

  • 0.57 Å

  • 0.99 Å


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439.

Wave nature of electrons was demonstrated by :

  • Schrodinger

  • de-Broglie

  • Davisson and Garmer

  • Heisenberg


440.

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:

  • 6p > 5f > 5p > 4d

  • 6p > 5f > 4d > 5p

  • 5f > 6p > 4d > 5p

  • 5f > 6p > 5p > 4d


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