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An electron with kinetic energy 5eV is i...

An electron with kinetic energy `5eV` is incident on a hydrogen atom in its ground state.The collision

A

must be elastic

B

may be partially elastic

C

may be completely elastic

D

may be completely inelastic

Text Solution

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The correct Answer is:
A
In hydrogen atom `E_(2)-E_(1)=10.2eV`. Since, energy difference is 10.2 eV which is greater than kinetic energy 5 eV the electron excited the hydrogen atom, hence collision must be elastic.
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-ATOMS, MOLECULES AND NUCLEI -Exercise 1 (TOPICAL PROBLEMS)
  1. If the energy of a hydrogen atom in nth orbit is E(n), then energy in ...

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  2. the ionization energy of Li^(++) is equal to

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  3. An electron with kinetic energy 5eV is incident on a hydrogen atom in ...

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  4. The potential energy of the orbital electron in the ground state of hy...

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  5. In which of the following systems will the radius of the first orbit (...

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  6. Compare the radii of the nuclei of mass numbers 27 and 64.

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  7. The wavelength of K(alpha) line in copper is 1.54 Å. The ionisation en...

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  8. In Raman effect, Stokes' lines are spectral lines having

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  9. Electrons in a certain energy level n=n(1) can emit 3 spectral lines. ...

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  10. A hydrogen-like atom emits rediationof frequency 2.7 xx 10^(15) Hz whe...

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  11. Taking the Bohr radius a(0) = 53 pm, the radius of Li^(++) ion in its ...

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  12. K(alpha) and K(beta) X-rays are emitted when there is a transition of ...

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  13. When two different materials A and B having atomic number Z(1) and Z(2...

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  14. Hard X -rays for the study of fractures in bones should have a minimum...

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  15. A beam of 350 keV electrons a molybdenum target, generating the X-rays...

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  16. An X-rays of wavelength 0.140 nm are scattered from a block of carbon....

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  17. X-ray of wavelength lamda=2 Å is emitted from the metal target. The po...

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  18. If a source of power 4 kW produces 10^(20) photons//second, the radiat...

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  19. A nucleus splits into two nuclear parts having radii in the ratio 1:2 ...

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  20. The mass defect in a particular nuclear reaction is 0.3 grams. The amo...

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