A small point of style is that when the word 'blackbody' is used as an adjective, it is usually written as a single unhyphenated word, as in 'blackbody radiation'; whereas when 'body' is used as a noun and 'black' as an adjective, two separate words are used. Thus a black body emits blackbody radiation. Black Body Radiation: Classical physics predicted that hot objects would instantly radiate away all their heat into electromagnetic waves. The calculation, which was based on Maxwell's equations and Statistical Mechanics, showed that the radiation rate went to infinity as the EM wavelength went to zero, ``The Ultraviolet Catastrophe'. The basic goal of this experiment is the determination of the solar surface temperature from the relative intensities of the spectrum sampled at a number of wavelengths from 450 to 880 nm. The sampling is determined by a set of broadband interference filters that modulate the light intensity measured by the photocurrent in a reverse biased silicon diode. If the detailed characteristics of the filters and photodiode were all initially well known, a single set of measurements of sunlight through the filter set would suffice. In the absence of such information, the light from a tungsten lamp at different temperatures will be used to establish the appropriate calibrations. In addition, sunlight is also reddened by the atmosphere, which differentially absorbs the blue end of the spectrum. This effect can be corrected by measuring the spectral intensities as a function of zenith angle. Finally, least squares techniques determine the solar temperature by modeling the data with the Planck spectral distribution function. The experimental setup was developed by Professor Carl Akerlof at The University of Michigan. The experiment was performed during the workshop at the 2009 Topical Conference on Advanced Laboratories. %0 Conference Proceedings%A Chamarro, Dan%A Akerlof, Carl%D July%T Blackbody Radiation and the Solar Photosphere Temperature%B 2009 Topical Conference on Advanced Laboratories%C Ann Arbor, MI%S Sessions V, VII, XI, XIII - Parallel workshop%8 July 23-25%U Disclaimer: ComPADRE offers citation styles as a guide only. We cannot offer interpretations about citations as this is an automated procedure. Please refer to the style manuals in the area for clarifications. Be the first to know! With a better scientific understanding of radiation science, students will be able identify sources of non-ionizing and ionizing radiation in our world. Students will examine how they may be exposed to ionizing radiation, evaluate the benefits and risks associated with exposure and learn to identify situations in which they may choose to control or limit their exposure to ionizing radiation. Download the (90 pp, 4Mb, ) to introduce and define radiation terms used in the activities. Click each tab to select and download activities. You will need Adobe Reader to view some of the files on this page.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |