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MHT-CET Atoms — practice questions — page 2

Explore 80 free Atoms questions in MHT-CET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Atoms questions and exercises with answers

Showing questions 31–60 of 80.

How do the gaps between hydrogen levels change as n rises?Read the answer and worked solution →At room temperature, in which state are most hydrogen atoms found?Read the answer and worked solution →What energy photon is emitted when a hydrogen electron falls from n = 3 to n = 2?Read the answer and worked solution →How much energy frees an electron from a hydrogen atom already in the n = 2 state?Read the answer and worked solution →In which year was Niels Bohr awarded the Nobel Prize in Physics?Read the answer and worked solution →Who explained Bohr's angular momentum quantisation using the wave nature of electrons in 1923?Read the answer and worked solution →In de Broglie's explanation, how many electron wavelengths fit around the n = 4 Bohr orbit?Read the answer and worked solution →In which year did Davisson and Germer experimentally confirm the wave nature of electrons?Read the answer and worked solution →Bohr's model fails even for which simple atom?Read the answer and worked solution →What can Bohr's model not explain about hydrogen's lines?Read the answer and worked solution →The definite orbits of Bohr's model conflict with which principle?Read the answer and worked solution →In quantum mechanics, the energy of the hydrogen atom depends on which quantum number alone?Read the answer and worked solution →When does Bohr's orbital frequency equal the emitted line frequency?Read the answer and worked solution →Who obtained an empirical formula for a group of hydrogen line wavelengths in 1885?Read the answer and worked solution →Why does a rarefied gas in a glow tube emit only discrete wavelengths?Read the answer and worked solution →Electron orbit radius is about 10^-10 m and nuclear radius about 10^-15 m. What is their ratio?Read the answer and worked solution →Hydrogen spectral lines ending on the n = 1 level form which series?Read the answer and worked solution →In which region of the spectrum do all Lyman series lines lie?Read the answer and worked solution →The Brackett series of hydrogen consists of transitions ending on which level?Read the answer and worked solution →Which transition gives the Lyman-alpha line of hydrogen?Read the answer and worked solution →The Pfund series of hydrogen lines ends on which energy level?Read the answer and worked solution →In which year did J.J. Thomson put forward the first model of the atom?Read the answer and worked solution →By what popular name is Thomson's atom model known?Read the answer and worked solution →Under which scientist did Ernest Rutherford work as a research student?Read the answer and worked solution →Which two workers carried out the alpha scattering experiment in 1911?Read the answer and worked solution →Which metal formed the thin foil in the Geiger-Marsden scattering experiment?Read the answer and worked solution →An alpha particle is the same as the nucleus of which atom?Read the answer and worked solution →For gold, which atomic number is used when computing the nuclear charge Ze?Read the answer and worked solution →A tiny impact parameter scatters an alpha particle how?Read the answer and worked solution →What happens to an alpha particle hitting a nucleus head-on?Read the answer and worked solution →

Worked practice questions

How do the gaps between hydrogen levels change as n rises?

  1. Levels move farther apart
  2. Spacing doubles at each step
  3. Spacing stays exactly equal
  4. Levels come closer together
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Correct answer: D. Levels come closer together

Since En varies as -1/n^2, the gaps between successive levels shrink as n rises.

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At room temperature, in which state are most hydrogen atoms found?

  1. The ground state
  2. The n = 3 excited state
  3. The fully ionised state
  4. The first excited state
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Correct answer: A. The ground state

Ordinary thermal energy is far too small to excite hydrogen, so most atoms stay in n = 1.

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What energy photon is emitted when a hydrogen electron falls from n = 3 to n = 2?

  1. 10.2 eV
  2. 1.89 eV
  3. 3.40 eV
  4. 1.51 eV
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Correct answer: B. 1.89 eV

E3 - E2 = -1.51 eV - (-3.40 eV) = 1.89 eV.

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More Physics topics

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