Evolution of quasi-history in a Physics Textbook
The primary aim, in teaching physics, is that the student should gain an understanding of the principles of physics and how to apply them to different problems. A secondary aim is to allow the students to appreciate the scientific approach and significance of it in the evolution of science and society. One approach for the second aim has been to include 'historical material' in physics textbooks. The quantity of the historical material included is quite diverse, from textbooks with a very strong historical approach to others without any historical material. The quality of the material included is also diverse. In this article we focus on the development of the historical material, i.e. a certain historical development, in a specific textbook (Sears & Zemansky's University Physics) over a number of editions. The aim is to see when and how the historical material is included and how well it describes the actual history. Will the physics adapt to history or vice-verse. The event of interest is the introduction of the Blackbody radiation formula or Planck's radiation formula. This is well known out of an historical perspective, but also a case where a quasi-historical is quite common in textbooks.