A source emitting sound of frequency $288 \mathrm{~Hz}$ is tied to a string of $100 \mathrm{~cm}$ length and rotated with an angular velocity of $20 \mathrm{rad} \mathrm{s}^{-1}$ in the horizontal plane. The range of frequencies heard by an observer standing at a distance of $5 \mathrm{~m}$ from the source is (in $\mathrm{Hz}$) (Speed of sound in air $=340 \mathrm{~ms}^{-1}$)

• A

  $275 \text { to } 320$
• Correct answer
  B

  $272 \text { to } 306$
• C

  $288 \text { to } 340$
• D

  $278 \text { to } 298$

Hence, the correct answer is option: 'B'.