Atomic and Nuclear Physics
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Questions and Answers

What is the wavelength of the emitted radiation dependent on?

  • Velocity of light
  • Wave number of the emitted radiation
  • Energy difference between the energy levels (correct)
  • Frequency of the emitted radiation

What is the number of spectral lines emitted if an electron jumps from nth orbit to ground state?

  • (n-1)n/2
  • (n-1)(n+1)/2
  • (n-1)(n+1)
  • (n-1)n (correct)

Which series of spectral lines is formed when an electron jumps from higher energy orbit to lower energy orbit?

  • Lymen series
  • Balmer series
  • Paschen series
  • Any of the above (correct)

What is the relationship between the wave number and the wavelength of the emitted radiation?

<p>Wave number is inversely proportional to the wavelength (A)</p> Signup and view all the answers

What is the energy difference between the energy levels dependent on?

<p>Rydberg constant and the atomic number (D)</p> Signup and view all the answers

What is the term for the numbers that provide complete information about all the electrons in an atom?

<p>Quantum numbers (C)</p> Signup and view all the answers

What is the physical phenomenon that occurs when an electron transitions to a lower energy level, resulting in the emission of a photon?

<p>Emission spectrum (A)</p> Signup and view all the answers

What is the maximum wavelength of the first member of a spectral series, such as the Balmer series?

<p>$\lambda_{max}$ (D)</p> Signup and view all the answers

According to Bohr's theory, what is the relationship between the energy levels of an electron and its corresponding orbital radii?

<p>Energy levels are inversely proportional to orbital radii (B)</p> Signup and view all the answers

What is the condition for the emission of spectral lines from a hydrogen atom, according to Bohr's theory?

<p>$n_2 &gt; n_1$ (A)</p> Signup and view all the answers

What is the energy of the first excited state of a hydrogen atom?

<p>– 3.4 eV (C)</p> Signup and view all the answers

What is the energy required to remove an electron from a hydrogen atom in its ground state?

<p>13.6 eV (D)</p> Signup and view all the answers

What is the frequency of the photon emitted when an electron transitions from a higher energy level to a lower energy level?

<p>ν = E2 – E1 / h (C)</p> Signup and view all the answers

What is the characteristic of the spectral lines emitted by a hydrogen atom?

<p>They are sharp and straight vertical lines of a single colour (D)</p> Signup and view all the answers

What is the equation that describes the energy levels of a hydrogen atom?

<p>E = – 13.6 / n^2 (D)</p> Signup and view all the answers

What is the relationship between the nuclear radius and the mass number of an atom?

<p>R ∝ A^1/3 (B)</p> Signup and view all the answers

What is the volume of the nucleus given by?

<p>3/4 π (R A^1/3)^3 (B)</p> Signup and view all the answers

What is responsible for keeping the nucleons bound together in the nucleus?

<p>Strong nuclear force (C)</p> Signup and view all the answers

What is the nuclear density of an atom given by?

<p>mA / (4/3 π (R A^1/3)^3) (B)</p> Signup and view all the answers

What is the name of the scientist who proposed the theory of exchange of mesons between nucleons to explain the nuclear force?

<p>Yukawa (A)</p> Signup and view all the answers

What percentage of the mass is accounted for by the nucleus in the atomic structure?

<p>99.95% (B)</p> Signup and view all the answers

What is the main purpose of the Geiger and Marsden experiment?

<p>To study the scattering of α-particles by gold foil (B)</p> Signup and view all the answers

What is the main limitation of Thomson's atomic model?

<p>It cannot explain the scattering of α-particles (C)</p> Signup and view all the answers

What is the main characteristic of the α-particles that are scattered by 180°?

<p>They are very few in number (B)</p> Signup and view all the answers

What is the relationship between the number of scattered particles (N) and the thickness of the foil (t)?

<p>N ∝ t (C)</p> Signup and view all the answers

What is the approximate size of the nucleus in meters?

<p>10^-15 m (D)</p> Signup and view all the answers

What is the proportion of the nucleus to the total volume of the atom?

<p>less than 10^(-12)% (C)</p> Signup and view all the answers

What is the force that holds quarks together inside a nucleus?

<p>Strong nuclear force (D)</p> Signup and view all the answers

What is the density of the nucleus in comparison to the atom?

<p>Much denser (A)</p> Signup and view all the answers

Which physicist's theory described the strong nuclear force?

<p>Yukawa (C)</p> Signup and view all the answers

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