A) 4 beats per second with intensity ratio 25 : 16 between waxing and waning.
B) 8 beats per second with intensity ratio 25 : 16 between waxing and waning
C) 8 beats per second with intensity ratio 81: 1 between waxing and waning
D) 4 beats per second with intensity ratio 81 : 1 between waxing and waning
Correct Answer: D
Solution :
[d] \[2\pi {{f}_{1}}=600\pi \] \[{{f}_{1}}=300\] ... (i) \[2\pi {{f}_{2}}=608\pi \] \[{{f}_{2}}=304\] ...(ii) \[\left| {{f}_{1}}-{{f}_{2}} \right|=4\,beats\] \[\frac{{{I}_{\max }}}{{{I}_{\operatorname{m}.n.}}}=\frac{{{({{A}_{1}}+{{A}_{2}})}^{2}}}{{{({{A}_{1}}+{{A}_{2}})}^{2}}}=\frac{{{(5+4)}^{2}}}{{{(5-4)}^{2}}}=\frac{81}{1}\] where\[{{A}_{1}}\],\[{{A}_{2}}\] are amplitudes of given two sound wave.You need to login to perform this action.
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