Vibration
Pitch of vibrating objects is determined by the frequency of their vibrations. Objects that vibrate at a higher frequency produce higher pitch sounds, while objects that vibrate at a lower frequency produce lower pitch sounds.
Because all the objects have a natural frequency
Higher frequencies produce the perception of higher pitch sound. A woman's voice generally contains sounds with higher frequencies than a man's voice contains. An infant's voice contains higher frequencies than an adult's voice does.
No. There is a frequency range in which people can hear. Very high frequency or low frequency sounds are inaudible to us, but can be heard by some other creatures, like dogs for example.
Sound is created by the vibration of air. The faster the vibration, the higher the sound. Smaller objects can vibrate faster than larger objects (of the same kind) and therefore have a higher pitched sound.
Sounds in this range are known as ultrasound. They have frequencies from about 20 kHz to a few GHz. Even the sounds at the low-frequency end are beyond the ability of most people to hear.
Objects that vibrate with large amplitudes typically produce louder and more intense sounds. These sounds may be lower in frequency and have a deeper tone compared to objects vibrating with smaller amplitudes. The amplitude of vibration directly influences the volume and intensity of the sound produced.
effect of high frequency sounds
Bat echolocation is an example of ultrasonic sounds, as bats emit high-frequency sound waves that bounce off objects and allow them to navigate and hunt in the dark.
High-pitched sounds have a higher frequency compared to low-pitched sounds.
When objects vibrate quickly, they produce higher-pitched sounds. The frequency of the vibrations determines the pitch of the sound, with faster vibrations corresponding to higher pitches.
I assume you mean the frequency at which the head moves back and forth. If this happens only at a certain frequency, then it sounds as if that is caused by resonance - which happens when the excitation (in this case, the head moving back and forth) has a similar frequency to the object's (the printer's) natural frequency.