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}} $