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1. If the energy density of the cosmic background of a parallel universe is 4.73 x 10^-13 J/m³, according to Planck's Law, what is the temperature of that universe? 625°C 625 K 5.0 K 1.5 x10¹¹ K None of the above 2. Which statement is true regarding Bohr model of the atom? It assumes stable electronic orbits whose radii and energies are quantized. It perfectly explains the emission lines in the hydrogen spectrum. An orbiting electron will gradually lose energy and should eventually spiral down to the nucleus leading to the collapse of the atom. But this expected consequence is not happening. The model model does not explain this fact. 1 and 2 2 and 3 1 and 3 2 only All are true.

1. If the energy density of the cosmic background of a parallel universe is 4.73 x 10^-13 J/m³, according to Planck's Law, what is the temperature of that universe? 625°C 625 K 5.0 K 1.5 x10¹¹ K None of the above 2. Which statement is true regarding Bohr model of the atom? It assumes stable electronic orbits whose radii and energies are quantized. It perfectly explains the emission lines in the hydrogen spectrum. An orbiting electron will gradually lose energy and should eventually spiral down to the nucleus leading to the collapse of the atom. But this expected consequence is not happening. The model model does not explain this fact. 1 and 2 2 and 3 1 and 3 2 only All are true.

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1. If the energy density of the cosmic background of a parallel universe is 4.73 x 10^-13 J/m³, according to Planck's Law, what is the temperature of that universe?

  • 625°C
  • 625 K
  • 5.0 K
  • 1.5 x10¹¹ K
  • None of the above

2. Which statement is true regarding Bohr model of the atom?

  1. It assumes stable electronic orbits whose radii and energies are quantized.
  2. It perfectly explains the emission lines in the hydrogen spectrum.
  3. An orbiting electron will gradually lose energy and should eventually spiral down to the nucleus leading to the collapse of the atom. But this expected consequence is not happening. The model model does not explain this fact.
  • 1 and 2
  • 2 and 3
  • 1 and 3
  • 2 only
  • All are true.
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