Class 12th "SOLID STATE"

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BEAGG'S EQUATION
 W. L. Bragg & W. H. Bragg the two  scientists has given this equation. 

Derivation of Bragg Equation :
•  इस diagram के अनुसार क्रिस्टल के एक पुंज को आपतित कोण ( glancing angle) थीटा (Q) पर गिराया गया। 
•  क्षैतिज रेखाएँ KL & MN क्रिस्टल मे दो उत्रोतर Atomic तलों को व्यक्त करती है। 
•  KL & MN दोनों एक दूसरे से d distance पर हैं। 
•  AB & CD incident and reflected X-rays पर खींचे perpendicular(लंबवत) plane(तल) हैं। 
•  Incident and Reflected bunch(पुंज) पर EG & EH perpendicular plane खींचे जाने पर दोनो पुंजों (bunches) की path distance  = GF + FH
•  इसकी value wave length का पूर्ण गुणांक (n) होना चाहिए, 
        

n = order (1,2,3....) 
Laimda = wave length of rays
d = distance between layers of atoms in a crystal. 
  

       
                           Thank you ! 


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