A tuning fork and an air column whose temperature is $51^{\circ} C$ produce $4$ beats in one second, when sounded together. When the temperature of air column decreases the number of beats per second decreases. When the temperature remains $16^{\circ} C$ only one beat per second is produced. The frequency of the tuning fork is ........... $Hz$
  • A$100$
  • B$75$
  • C$150$
  • D$50$
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