A) \[1.2\times {{10}^{-7}}m\]
B) \[2.4\times {{10}^{-7}}m\]
C) \[2.0\times {{10}^{-7}}m\]
D) \[1.0\times {{10}^{-7}}m\]
Correct Answer: D
Solution :
[d] \[{{P}_{\max }}-{{P}_{\min }}=2\Delta {{P}_{0}}\] where \[\Delta {{P}_{0}}\] is pressure amplitude. \[\therefore \,\,\,\,\,2\Delta {{P}_{0}}=0.2\] \[\Rightarrow \,\,\,\Delta {{P}_{0}}=0.1N{{m}^{-2}}\Rightarrow BAk=0.1\] \[\Rightarrow \,\,\,A=\frac{0.1\times \lambda }{2\pi B}=\frac{0.1\times 1.0}{2\times 3.14\times 1.5\times {{10}^{5}}}=1.0\times {{10}^{-7}}m\]
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