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NEET UG Atoms — practice questions — page 3

Explore 82 free Atoms questions in NEET UG 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 61–82 of 82.

In the hydrogen energy level scheme, what energy corresponds to n equal to infinity?Read the answer and worked solution →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 →

Worked practice questions

In the hydrogen energy level scheme, what energy corresponds to n equal to infinity?

  1. +13.6 eV
  2. -13.6 eV
  3. -3.40 eV
  4. 0 eV
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Correct answer: D. 0 eV

At n equal to infinity the electron is removed from the nucleus and at rest, so its energy is zero.

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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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