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Burko, Lior M. – European Journal of Physics, 2008
Introductory calculus-based physics textbooks state that electromagnetic waves are transverse and list many of their properties, but most such textbooks do not bring forth arguments why this is so. Both physical and theoretical arguments are at a level appropriate for students of courses based on such books, and could be readily used by…
Descriptors: Introductory Courses, Textbooks, Physics, Radiation
Viana-Gomes, J.; Peres, N. M. R. – European Journal of Physics, 2011
We derive the energy levels associated with the even-parity wavefunctions of the harmonic oscillator with an additional delta-function potential at the origin. Our results bring to the attention of students a non-trivial and analytical example of a modification of the usual harmonic oscillator potential, with emphasis on the modification of the…
Descriptors: Textbooks, Quantum Mechanics, Calculus, Spreadsheets
Ferrario, Carlo; Passerini, Arianna – European Journal of Physics, 2007
In the framework of Noether's theorem, a distinction between Lagrangian and dynamical symmetries is made, in order to clarify some aspects neglected by textbooks. An intuitive setting of the concept of invariance of differential equations is presented. The analysis is completed by deriving the symmetry properties in the motion of a charged…
Descriptors: Calculus, Science Instruction, Physics, Scientific Concepts