Details:

• The device that is used for demonstrating the relationship between the frequency of the sound that is produced by the string when it is plucked and the tension, length, and mass per unit length of the string.
• The sound is produced in the transverse standing wave in the string.
• The string is stretched between a fixed and a movable pulley, with a weight attached to the movable pulley.
• The movable pulley is moved until the string is in tune with a known frequency.
• The distance between the fixed and movable pulleys is measured.