Question

A source and a listener are both moving towards each other with speed $1.11f$ , where v is the speed of sound. If the frequency of the note emitted by the source is $1.22f$ , the frequency heard by the listener would be nearly

• A. f
• B. $1.27f$
• C. $\text{1}.0\text{1}\times \text{1}{0}^{\text{5}}\text{ N}/{\text{m}}^{\text{2}}$
• D. $\text{9}.\text{13}\times \text{1}{0}^{\text{4}}\text{ N}/{\text{m}}^{\text{2}}$

Answer 1

Answer: (B)

Source and observer both are moving, so apparent frequency $\text{9}.\text{13}\times \text{1}{0}^{\text{3}}\text{N}/{\text{m}}^{\text{2}}$ $\text{18}.\text{26 N}/{\text{m}}^{\text{2}}$ where, v = speed of sound $\text{2}.\text{25}\times \text{1}{0}^{\text{3}}\text{min}$ $\text{3}.\text{97}\times \text{1}{0}^{\text{3}}\text{min}$ $9.13\times {10}^{3}N/m^2$