how is the frequency of sound varied in the three types of musical instruments
Answers
Making music
The vibration of some device, such as a wire, drum, or reed, creates musical sounds. Sometimes moving air can be made to vibrate at certain frequencies.
Vibrating wire
If you tie a string or wire tightly between two posts, you can start it vibrating by plucking or tapping it. The vibration creates compression waves in the air, resulting in sound, according to the frequency of the waves.
Musical instruments that use vibrating wire to produce sound include the guitar, violin, piano and harp.
Factors determining pitch
The frequency, wavelength or pitch of the sound depends on what the string or wire is made of, its thickness, its length, and how tight it is strung between the posts. Material, length and thickness are usually combined and indicated as the mass of the string in the String Frequency Equation. (See Equation for Sound Created from a String for more information.)
Tuning a string instrument
The frequency from a vibrating wire is relative pure. In other words, it primarily consists of one frequency. This fact is used in tuning the musical instrument. By adjusting the tension of the wire, the frequency can be changed slightly until it is exactly at some set pitch.
Although some experts can tell that it is at the correct pitch with their ears, a more accurate way is to use a tuning fork that is calibrated at the desired frequency. When two sounds are almost at the same frequency, a throbbing sound is heard. It is also called the beat frequency.
This frequency gets slower and slower as the string reaches the same frequency of the tuning fork. When the beat frequency disappears, the string is tuned to the exact pitch of the tuning fork.
Drums
A drum is made by stretching some material over a container. Striking the head of the drum causes it to vibrate and make a sound. In reality, the head of a drum is like a string in two-dimensions.
Being in two-dimensions, the vibration of the drum head can be fairly complex. An interesting experiment is to sprinkle some powder on the hear of a drum and then strike it gently. The vibration of the drumhead will create a pattern in the powder.
Answer:
string instrument
they are instrument in which vibration in a stretched metals wires (called strings) produce musical sound. The frequency of vibration is varied by changing the thickness, tightness and length of string some examples guitar, sitar, sarod, Veena and violin.
wind instrument
they are instrument in which vibration in air column produce sound. The frequency is varied by changing the length of vibrating air column example clarinet , shehnai and flute.
percussion instruments
they are instrument in which vibration stretched skin produce sound. The frequency of vibration can be increased by stretching the skin more example drums, mrindangam and tabla.