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| 2. |
- Redfors, Andreas, 1961-, et al.
(författare)
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The Fe II excitation mechanism in KQ Puppis
- 2000
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Ingår i: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 364:2, s. 646-654
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Tidskriftsartikel (refereegranskat)abstract
- We discuss different excitation processes behind the Fe II emission lines in the IUE spectrum of KQ Puppis (Boss 1985), a VV Cephei type of spectroscopic binary. Several pa pers have been published on the subject suggesting a number of processes behind the strong Fe II emission lines. We propose that there are two processes operating: selective photoexcitation by continuum radiation (PCR) from the B-star companion, and photoexcitation by accidental resonance (PAR) by the H Ly alpha radiation field. We suggest excitation channels for each of the Fe II emission lines identified in the spectrum.
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| 3. |
- Redfors, Andreas, 1961-
(författare)
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University physics students' use of explanatory models
- 2003
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Ingår i: Physics in new fields and modern applications - opportunities for physics education. - Lund : Teach support.
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Konferensbidrag (refereegranskat)abstract
- We have examined university physics students’ use of models when explaining phenomena concerning the interaction between electromagnetic radiation and matter. A range of scientific models are available to explain the phenomena. The student sample is drawn from six universities in UK and Sweden. The sample students have difficulties in providing appropriate explanations for the phenomena. Few students use a single model consistently in their explanations of related phenomena. Students' use of models appears to be highly sensitive to the context in which the phenomena to be explained is presented to them.
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| 4. |
- Redfors, Andreas, 1961-, et al.
(författare)
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University physics students' use of models in explanations of phenomena involving interaction between metals and radiation
- 2001
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Ingår i: International Journal of Science Education. - 0950-0693 .- 1464-5289. ; 23:12, s. 1283-1301
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Tidskriftsartikel (refereegranskat)abstract
- We examine third year university physics students' use of models when explaining familiar phenomena involving interaction between metals and electromagnetic radiation. A range of scientific models are available to explain these phenomena. However, explanations of these phenomena tend not to be used as exemplars of scientific models within undergraduate physics education. The student sample is drawn from six universities in UK and Sweden. These students have difficulties in providing appropriate explanations for the phenomena. Many students draw upon the Bohr model of isolated atoms when explaining light emission of metals. The students tend not to recognize that atoms in metals interact to give an electronic structure very different from that of the isolated atom. Few students use a single model consistently in their explanations of these related phenomena. Rather, students' use of models is sensitive to the context in which each phenomenon is presented to them.
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