A sound source of frequency 512 Hz is producing 6 beats with a guitar. If the string of guitar is stretched slightly then beat frequency decreases. The original frequency of guitar is
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Beats Frequency of tuning fork is 512 Hz. Frequency of sonometer wire either 512 + 6 or 512 – 6
As tension increases frequency of sonometer wire increases n α 
No. of beat reduces. So that frequency of sonometer wire is = 512 – 6 = 506 Hz
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