12.Atoms
hard

यदि ${90^o}$ कोण पर प्रकीर्णित कण $56$ हों तो ${60^o}$ कोण पर यह होंगे

A

$224$

B

$256$

C

$98$

D

$108$

Solution

प्रकीर्णन सूत्र से,

$N \propto \frac{1}{{{{\sin }^4}(\theta /2)}} \Rightarrow \frac{{{N_2}}}{{{N_1}}} = {\left[ {\frac{{\sin ({\theta _1}/2)}}{{\sin ({\theta _2}/2)}}} \right]^4}$

$ \Rightarrow \frac{{{N_2}}}{{{N_1}}} = {\left[ {\frac{{\sin \frac{{{{90}^o}}}{2}}}{{\sin \frac{{{{60}^o}}}{2}}}} \right]^4} = {\left[ {\frac{{\sin {{45}^o}}}{{\sin {{30}^o}}}} \right]^4}$

$ \Rightarrow {N_2} = {(\sqrt 2 )^4} \times {N_1} = 4 \times 56 = 224$

Standard 12
Physics

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