What is the frequency of a X-ray photon whose momentum is 1.1 x 1

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 Multiple Choice QuestionsMultiple Choice Questions

371.

Which of the following sets of quantum numbers is not possible ?

  • n = 4 , l =1 , m = 0 , s = + 12

  • n = 4 , l = 3 , m = - 3 , s = - 12

  • n = 4 , l = 1 , m = + 2 , s = - 12

  • n = 4 , l = 0 , m = 0 , s = - 12


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372.

What is the frequency of a X-ray photon whose momentum is 1.1 x 10-23 kg-ms-2 ?

  • 5 x 1016 Hz

  • 0.5 x 1027 Hz

  • 0.5 x 1018 Hz

  • 5 x 1018 Hz


D.

5 x 1018 Hz

E = mc2

E = hv

mc2 = hv

ν = mc2h = 1.1 × 10-23 × 3 × 1086.6 × 10-34

= 5  x 1018 Hz


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373.

The magnitude of orbital angular momentum of an electron of azimuthal quantum number 2 is :

  • 2h2π

  • 6h2π

  • 2h2π

  • 6h2π


374.

For an electron , if the uncertainty in velocity is v , the uncertainty in its position (x)  is given by :

  • hm4πν

  • 4πhmν

  • h4πmv

  • 4πmhν


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375.

A metal surface is exposed to solar radiations :

  • the emitted electrons have energy less than a maximum value of energy depending upon frequency of incident radiations

  • the emitted electrons have energy less than maximum value of energy depending upon intensity of incident radiations

  • the emitted electrons have zero energy

  • the emitted electrons have energy equal to energy of photons of incident light


376.

Which of the following transitions have minimum wavelengths ?

  • n4  n1

  • n2  n1

  • n4  n2

  • n3  n1


377.

Orbital is :

  • circular path around the nucleus in which the electrons revolves

  • space around the nucleus where the probability of finding the electron is maximum

  • amplitude of electron wave

  • none of the above


378.

Which of the following sequence is correct as per Aufbau principle ?

  • 3s < 3d < 4s < 4p

  • ls < 2p < 4s < 3d

  • 2s < 5s < 4p < 5d

  • 2s < 5s < 4p < 5f


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379.

A radioactive nucleus will not emit :

  • alpha and beta rays simultaneously

  • beta and gamma rays simultaneously

  • gamma and alpha rays

  • gamma rays only


380.

X-rays are emitted during

  • α, n reaction

  • K-capture

  • n, α-reaction

  • β- emission 


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