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Exploring the inverse square law for light.

Exploring the inverse square law for light


To examine the inverse square law for light emitted by the real sources.

Wilhelm Wien (1864-1928), German physicist who received the Nobel Prize for Physics in 1911 for his work on heat radiation. He formulated the displacement law of blackbody radiation spectra at different temperatures. It led to new techniques for illumination and the measurement of high temperatures. His studies on electrical discharges, nature of cathode rays, canal rays and their behaviour in magnetic and electric fields gave basis for later development of mass spectrography. Wien's work contributed to the transition from Newtonian to quantum physics; to the quantum theory of radiation in particular.

The distance dependence of the irradiance due to the household incandescent light bulb is explored using simple goniometer. The experimental data are analysed in terms of the inverse square law.

Theory  |   Apparatus setup   |  Data acquisition  |   Data sample  |  Data analysis (TI83)  |  Data analysis (MSExcel)  |  PDF version of the module  |  Evaluation form  |  Back to Experiments  ]

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