PhysicsMedium85×since 2002Q8488A tuning fork vibrates with frequency 256256256 HzHzHz and gives one beat per second with the third normal mode of vibration of an open pipe. What is the length of the pipe ? (Speed of sound in air is 340 ms−1340\,m{s^{ - 1}}340ms−1)A220220220 cmcmcmB190190190 cmcmcmC180180180 cmcmcmD200200200 cmcmcmCheck answerSkip