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A sound consists of four frequencies : 3...

A sound consists of four frequencies : `300 Hz , 600 Hz,1200 Hz and 2400 Hz`. A sound 'filter' is made by passing this sound through a bifurcate pipe as shown . The sound wave has to travel a distance of `50 cm` more in the right branch - pipe than in the straight pipe. The speed of sound in air is `300 m//s`. Then , which of the following frequencies will be almost completely muffled or 'silenced' at the outlet?

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