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QJEEM20Phdc2f: JEE Main 2020 Physics - Class 11 JEEM20Phdc2f Solution: In a resonance tube experiment when the tube is filled with…

In a resonance tube experiment when the tube is filled with water up to a height of 17.0 cm from bottom, it resonates with a given tuning fork. When the water level is raised the next resonance with the same tuning fork occurs at a height of 24.5 cm. If the velocity of sound in air is 330 m/s, the tuning fork frequency is :

Multiple Choice Options

  • A 2200 Hz
  • B 3300 Hz
  • C 1100 Hz
  • D 550 Hz

Step-by-Step Verified Solution

l1=l−17

l2=l−24.5

We know, v=2f(l1−l2)

⇒ 330=2×f×[(f×[(l−17)−(l−24.5)]×10−2

⇒ 165=f×7.5×10−2

⇒ f=165×10007.5

⇒ f=2200Hz

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