In successive emission of α-and β-particles, the numbe

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 Multiple Choice QuestionsMultiple Choice Questions

61.

A near UV photon of 300 nm is absorbed by a gas and then re-emitted as two photons. One photon is red with wavelength 760 nm. Hence, wavelength of the second photon is

  • 1060 nm

  • 496 nm

  • 300 nm

  • 215 nm


62.

What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition, n = 4 to n = 2 of He+ spectrum?

  • n = 4 to n = 2

  • n = 3 to n = 2

  • n = 2 to n = 1

  • n = 4 to n = 3


63.

What is the degenercy of the level of H-atom that has energy -RH9 ?

  • 16

  • 9

  • 4

  • 1


64.

What is the EAN of [Al(C4O4)3]3- ?

  • 28

  • 22

  • 16

  • 10


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65.

An isobar of 20C40 is

  • 18Ar40

  • 20Ca38

  • 20Ca42

  • 18Ar38


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66.

In successive emission of α-and β-particles, the number of α-and β-particles should be emitted for the conversion of 92U238 to 82P206 are

  • 7α, 5β

  • 6α, 4β

  • 4α, 3β

  • 8α, 6β


D.

8α, 6β

U23892  Pb20682 + m2He4 + n-1e0On comparing both sides 238 = 206 + 4m  m=8     92= 82+ 2m-n 2m-n= 10  n =6α-particles emitted, m = 8 β-particles emitted, n = 6 


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67.

An element xAy emits 5 α and 4β particles to give 82B207. The number of protons and neutrons in A are respectively

  • 88, 227

  • 88, 139

  • 82, 227

  • 84, 139


68.

Which of the following has the maximum penetrating power ?

  • α- particle

  • γ-particles

  • Proton

  • Positron


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69.

Which of the following travels with the speed of light?

  • α-rays

  • β-rays

  • γ-rays

  • X-rays


70.

4 L- atom is equal to

  • 40.50 cal

  • 78.75 cal

  • 95.23 cal

  • 96 cal


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