Answer:
Step-by-step explanation:
To tune a piano using a tuning fork, the piano tuner will start by striking the tuning fork and then placing it on the body of the piano near the middle C key. The tuner will then play the middle C key on the piano and listen to the pitch of the note. If the pitch of the middle C key is higher than the pitch of the tuning fork, the tuner will know that the middle C key on the piano needs to be lowered in pitch.
To lower the pitch of the middle C key, the tuner will apply a small amount of pressure to the center of the key with a finger or a tool. This will stretch the string inside the piano slightly, lowering its pitch. The tuner will continue to adjust the pitch of the middle C key until it is in tune with the pitch of the tuning fork.
The tuner will use their knowledge of beat frequency to bring the piano into tune. Beat frequency is the phenomenon that occurs when two sounds with slightly different frequencies are played together. The sound waves produced by these two sounds will interfere with each other, causing a pulsating or "beating" effect. The number of beats per second, or the beat frequency, is equal to the difference in frequency between the two sounds.
To tune the piano using beat frequency, the tuner will listen for the beat frequency between the pitch of the middle C key and the pitch of the tuning fork. If the beat frequency is slow, it means that the pitch of the middle C key is lower than the pitch of the tuning fork. If the beat frequency is fast, it means that the pitch of the middle C key is higher than the pitch of the tuning fork. The tuner will continue to adjust the pitch of the middle C key until the beat frequency disappears, indicating that the pitch of the middle C key and the pitch of the tuning fork are the same. At this point, the middle C key on the piano will be in tune with the tuning fork.