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<!doctype html PUBLIC"-//W3C//DTD XHTML 1.0 Strict //EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml-strict.dtd">
<html xml:lang="en" xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<title>WEIN's LAW</title>
<link rel="stylesheet" href="layout.css" media="screen" />
</head>
<body background="images/bg.jpg">
<div id="container">
<div id ="content">
<h1 align="center">PHYSICS VIVA QUESTION</h1><br><br><br>
<h2 align="center" font-size-adjust:200px><B><i>WEIN's LAW</B></h2><br><br>
<p>
<br>
<b>Q1.Define Wien’s distribution law. </b> <br><br>
<b>A</b>. Wien’s approximation also called Wien’s distribution law is a law of physics used to describe the spectrum of thermal radiation frequently called the blackbody function. <br><br>
<b>Q2.Define Wien’s displacement law. </b> <br><br>
<b>A</b>. Wien’s displacement law states that the black body radiation curve for different temperatures peaks at a wavelength inversely proportional to the temperature. <br><br>
<b>Q3.What is a black body? </b> <br><br>
<b>A</b>. A black body is one that absorbs all incident electromagnetic radiations and once it reaches thermal equilibrium emits electromagnetic radiations called black body
<br> radiations. <br><br>
<b>Q4.What kind of solar cell is used? </b> <br><br>
<b>A</b>.Photo-voltaic cell- Celliniun type. <br><br>
<b>Q5.Define photo-voltaic effect. </b> <br><br>
<b>A</b>.The “photovoltaic effect” is the basic physical process through which a solar cell converts sunlight into electricity<br><br>
<b>Q6.Why do we use different filters? </b> <br><br>
<b>A</b>.So as to allow light of only certain frequency to pass. <br><br>
<b>Q7.What is the value of Boltzman constant? </b> <br><br>
<b>A</b>. kB= 1.387 x 10^-23 Joules/Kelvin<br><br>
<b>Q8.What is Planck’s law? </b> <br><br>
<b>A</b>.Planck’s law describes the electromagnetic radiation emitted by a black body in thermal equilibrium at a definite temperature. <br><br>
<b>Q9.What is Rayleigh-Jeans law? </b> <br><br>
<b>A</b>. Rayleigh–Jeans law attempts to describe the spectral radiance of electromagnetic radiation at all wavelengths from a black body at a given temperature through classical<br>
arguments. <br><br>
<b>Q10.What was so special that Planck’s law overrode wein’s and Rayleigh’s? </b> <br><br>
<b>A</b>. Lord Rayleigh‘s hypothesis may be used to accurately describe the long wavelength spectrum of thermal radiation but fails to describe the short wavelength spectrum of<br>
thermal emission,similarly Wein’s law is true for short wavelength but fails for long wavelengths.But Planck’s law is true for the entire spectrum. <br><br>
<b>Q11.Define Draper current. </b> <br><br>
<b>A</b>.It is the minimum current required to just ignite the filament of the bulb. <br><br>
<b>Q12.Why do we assume that the bulb is a black body? </b> <br><br>
<b>A</b>.This is so because the condition to create a black body artificially is to enclose the light source in a container and provide a single thin & narrow outlet of light. <br><br>
<b>Q13.What is the standard value of planck’s constant? </b> <br><br>
<b>A</b>. h = 6.626 × 10-34 Joule-sec<br><br>
<b>Q14.Can we use photoelectric effect in place of this method to calculate Planck’s constant? </b> <br><br>
<b>A</b>.Yes,we can use it because in both light energy is converted to electrical energy. <br><br> <br><br><br><br>
<b><i>According to classical physics as the temperature rises so does the energy so hypothetically at some temperature the energy possessed by the object would become infinite but<br>
it is not so.Later on Planck’s said that each wave has an intrinsic energy independent of temperature. </i></b> <br><br>
<b>NOTE: </b> <br><br>
Please do study this graph–>http://en.wikipedia.org/wiki/File:Black_body.svg<br><br>
DO read about black body and planck’s law. </b> <br><br>
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