LEDs, or light-emitting diodes, are cheap, easy to purchase, and thus commonly used in physics instruction as indicators of electric current or as sources of light. In our opinion LEDs represent a unique piece of equipment that can be used to collect experimental evidence, and construct and test new ideas in almost every unit of a general physics course (and in many advanced courses) either as “black boxes” that allow students to study certain properties of a system of interest, as physical systems that allow students to learn an astonishing amount of physics that they usually do not encounter in a regular introductory physics course, and as non-traditional devices that allow students to construct concepts that are traditionally a part of a general physics course.
المراجع
- Bhalotra Y.P.R, (1963). Meteorology of Sudan., Meteorol. Serv., Mem., 6; 113 pp) El-Tom, Mahdi Amin, 1975. “The Rain of the Sudan: Mechanisms and Distribution” Khartoum University Press. Khartoum, Sudan.
- Griffiths (1974), World Survey of Climatology Vol. 10, ELSEVIER, 1972 (1974) pp 76-80.
- National Climate Prediction Center (NCEP –National Ocean Atmospheric Administration NOAA- USA); http:// nomad3. ncep.noaa.gov/pub/reanalysis-1/month/prs/; web page last visited April 2008.
