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22.4. Energy levels in atoms and line spectra
A subsection of Physics, 9702, through 22. Quantum physics
Listing 10 of 16 questions
Explain how the line spectrum of hydrogen provides evidence for the existence of discrete electron energy levels in atoms. Some electron energy levels in atomic hydrogen are illustrated in . A B energy –3.40 eV –1.50 eV –0.85 eV Two possible electron transitions A and B giving rise to an emission spectrum are shown. These electron transitions cause light of wavelengths 654 nm and 488 nm to be emitted. On , draw an arrow to show a third possible transition. Calculate the wavelength of the emitted light for the transition in . wavelength = m The light in a beam has a continuous spectrum of wavelengths from 400 nm to 700 nm. The light is incident on some cool hydrogen gas, as illustrated in . incident light emergent light cool hydrogen gas Using the values of wavelength in , state and explain the appearance of the spectrum of the emergent light.
9702_w11_qp_41
THEORY
2011
Paper 4, Variant 1
View
Explain how the line spectrum of hydrogen provides evidence for the existence of discrete electron energy levels in atoms. Some electron energy levels in atomic hydrogen are illustrated in . A B energy –3.40 eV –1.50 eV –0.85 eV Two possible electron transitions A and B giving rise to an emission spectrum are shown. These electron transitions cause light of wavelengths 654 nm and 488 nm to be emitted. On , draw an arrow to show a third possible transition. Calculate the wavelength of the emitted light for the transition in . wavelength = m The light in a beam has a continuous spectrum of wavelengths from 400 nm to 700 nm. The light is incident on some cool hydrogen gas, as illustrated in . incident light emergent light cool hydrogen gas Using the values of wavelength in , state and explain the appearance of the spectrum of the emergent light.
9702_w11_qp_42
THEORY
2011
Paper 4, Variant 2
View
White light is incident on a cloud of cool hydrogen gas, as illustrated in . cool hydrogen gas incident white light emergent light The spectrum of the light emerging from the gas cloud is found to contain a number of dark lines. Explain why these dark lines occur. Some electron energy levels in a hydrogen atom are illustrated in . –0.38 –0.55 –0.85 –1.51 energy / eV –3.41 One dark line is observed at a wavelength of 435 nm. Calculate the energy, in eV, of a photon of light of wavelength 435 nm. energy = eV On , draw an arrow to indicate the energy change that gives rise to this dark line.
9702_w14_qp_41
THEORY
2014
Paper 4, Variant 1
View
White light is incident on a cloud of cool hydrogen gas, as illustrated in . cool hydrogen gas incident white light emergent light The spectrum of the light emerging from the gas cloud is found to contain a number of dark lines. Explain why these dark lines occur. Some electron energy levels in a hydrogen atom are illustrated in . –0.38 –0.55 –0.85 –1.51 energy / eV –3.41 One dark line is observed at a wavelength of 435 nm. Calculate the energy, in eV, of a photon of light of wavelength 435 nm. energy = eV On , draw an arrow to indicate the energy change that gives rise to this dark line.
9702_w14_qp_42
THEORY
2014
Paper 4, Variant 2
View
A beam of light consists of a continuous range of wavelengths from 420 nm to 740 nm. The light passes through a cloud of cool gas, as shown in . incident light cool gas emergent light wavelengths 420 nm – 740 nm The spectrum of the light emerging from the cloud of cool gas is viewed using a diffraction grating. Explain why this spectrum contains a number of dark lines. Some of the electron energy levels of the atoms in the cloud of gas are represented in . energy – 0.38 eV – 0.54 eV – 0.85 eV – 1.5 eV – 3.4 eV – 13.6 eV (not to scale) Light of wavelength 420 nm has a photon energy of 2.96 eV. Calculate the photon energy, in eV, of light of wavelength 740 nm. photon energy = eV Use data from and your answer in to show, on , the changes in energy levels giving rise to the dark lines in .
9702_s17_qp_41
THEORY
2017
Paper 4, Variant 1
View
A beam of light consists of a continuous range of wavelengths from 420 nm to 740 nm. The light passes through a cloud of cool gas, as shown in . incident light cool gas emergent light wavelengths 420 nm – 740 nm The spectrum of the light emerging from the cloud of cool gas is viewed using a diffraction grating. Explain why this spectrum contains a number of dark lines. Some of the electron energy levels of the atoms in the cloud of gas are represented in . energy – 0.38 eV – 0.54 eV – 0.85 eV – 1.5 eV – 3.4 eV – 13.6 eV (not to scale) Light of wavelength 420 nm has a photon energy of 2.96 eV. Calculate the photon energy, in eV, of light of wavelength 740 nm. photon energy = eV Use data from and your answer in to show, on , the changes in energy levels giving rise to the dark lines in .
9702_s17_qp_43
THEORY
2017
Paper 4, Variant 3
View
Questions Discovered
16