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MHT-CET Atoms — practice questions — page 3

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 61–80 of 80.

From kinetic theory, what was the size of an atom known to be?Read the answer and worked solution →An atom is roughly how many times larger than its nucleus?Read the answer and worked solution →Why do atomic electrons hardly change the path of an alpha particle?Read the answer and worked solution →A 7.7 MeV alpha particle heads straight at a gold nucleus. What is its closest approach?Read the answer and worked solution →What is the actual radius of a gold nucleus?Read the answer and worked solution →Compared with the sum of nuclear and alpha radii, closest approach is?Read the answer and worked solution →Scaled to the atom's proportions, where would Earth orbit the sun?Read the answer and worked solution →In Rutherford's model, what supplies the electron's centripetal force in hydrogen?Read the answer and worked solution →What does a negative total energy of an orbiting electron indicate?Read the answer and worked solution →An electron in hydrogen's ground state has total energy -13.6 eV. What is its kinetic energy?Read the answer and worked solution →Electron speed 2.2 × 10⁶ m/s, orbit radius 5.3 × 10⁻¹¹ m. Classical light frequency?Read the answer and worked solution →Classically, what happens to an orbiting electron in Rutherford's atom?Read the answer and worked solution →What does an emission line spectrum look like?Read the answer and worked solution →Why can an emission line spectrum identify an unknown gas?Read the answer and worked solution →What did Johann Balmer obtain in 1885 for hydrogen?Read the answer and worked solution →Bohr's second postulate gives the allowed angular momentum of the electron as what?Read the answer and worked solution →In which year did Bohr present his model of the hydrogen atom?Read the answer and worked solution →The lowest-energy state of an atom, with the electron in the smallest orbit, is called what?Read the answer and worked solution →Which of these species has only one electron, like hydrogen?Read the answer and worked solution →In modern quantum mechanics, a Bohr orbit is replaced by what?Read the answer and worked solution →

Worked practice questions

From kinetic theory, what was the size of an atom known to be?

  1. About 1 femtometre
  2. About 1 millimetre
  3. About 0.1 nanometre
  4. About 1 micrometre
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Correct answer: C. About 0.1 nanometre

Kinetic theory gave an atomic size near 10^-10 m, which is 0.1 nm.

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An atom is roughly how many times larger than its nucleus?

  1. About 10 to 100 times
  2. About 1,000 to 2,000
  3. About 10,000 to 100,000
  4. About a billion times
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Correct answer: C. About 10,000 to 100,000

Atomic size near 10^-10 m divided by nuclear size near 10^-15 m to 10^-14 m gives 10^4 to 10^5.

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Why do atomic electrons hardly change the path of an alpha particle?

  1. They sit exactly at the nucleus centre
  2. They carry the same charge as alphas
  3. Their mass is tiny compared with an alpha
  4. They are locked inside the nucleus
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Correct answer: C. Their mass is tiny compared with an alpha

Electrons are so light that a heavy alpha particle is not appreciably deflected by them.

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More Physics topics

ElectrostaticsCurrent ElectricityOscillationsElectromagnetic InductionKinetic Theory of GasesMechanical Properties of FluidsWave OpticsThermodynamics