MHT CET Physics question

PhysicsWavesMHT CET

The equation of stationary wave on a string clamped at both ends and vibrating in third harmonic is where x and y are in cm, t in second. The length of the vibrating string is [MHT-CET 2019]

Answer: (B)

Solution

gives cm, and third harmonic means

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Question ID VK-070617