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How is Sound Produced by Musical Instruments? Video Lecture - Class 8
FAQs on How is Sound Produced by Musical Instruments? Video Lecture - Class 8
| 1. How is sound produced by musical instruments? |  |
Ans. Sound is produced by musical instruments through the vibration of their parts. When a musician plays a musical instrument, it causes the instrument's parts, such as strings, membranes, or air columns, to vibrate. These vibrations create sound waves that travel through the air and reach our ears, allowing us to hear the music produced by the instrument.
| 2. What are the different ways musical instruments produce sound? | |
Ans. Musical instruments can produce sound in various ways. Some instruments, like the guitar or piano, produce sound through the vibrations of strings. Others, like the drums or tambourine, produce sound through the vibration of a stretched membrane. Wind instruments, such as the flute or trumpet, produce sound by blowing air into or across the instrument. Each instrument has a unique method of sound production.
| 3. Can all musical instruments produce sound without any external force? | |
Ans. No, not all musical instruments can produce sound without any external force. Some instruments require the musician to pluck, strike, or blow into them to create vibrations and produce sound. For example, a violinist needs to use a bow to cause the strings of a violin to vibrate. However, there are also instruments, like pianos or organs, that can produce sound without external force by pressing keys that activate mechanisms within the instrument.
| 4. How does the shape and material of a musical instrument affect its sound production? | |
Ans. The shape and material of a musical instrument play a significant role in its sound production. The shape determines the resonance and amplification of sound waves produced by the instrument. For example, the hollow body of a guitar or violin helps to amplify the vibrations of the strings. The material used in constructing the instrument can also affect the tone and timbre of the sound produced. Different materials, such as wood, metal, or plastic, have different acoustic properties, resulting in varying sound characteristics.
| 5. Can the pitch of sound produced by a musical instrument be changed? | |
Ans. Yes, the pitch of sound produced by a musical instrument can be changed. The pitch refers to how high or low a sound is perceived. In many instruments, the pitch can be altered by changing the length, tension, or thickness of the vibrating element. For example, on a guitar, pressing down different frets on the strings changes the length of the vibrating portion, thus changing the pitch. Similarly, on a flute, covering or uncovering the finger holes alters the length of the air column, affecting the pitch.
Text Transcript from Video
Hello, my name's Kerina
and today we're going to think about the
question: how does an instrument make a sound?
To answer this question we first need to find out what sound is
Sound is caused by vibrations
that travel through the air and other materials to reach our ears
I can demonstrate using these pipes. By hitting the end of the tube
air is forced through the tube which causes the column of air inside the tube to vibrate
you may have noticed that we just heard
different types of sound. We hear these
different types of sound because of the number of vibrations.
We called the number of times something vibrates
in one second its Frequency, and we measure it in Hertz.
So if something vibrates 3 times in one second
its frequency is 3Hz
A long or big instrument creates a low frequency, giving us a low pitch.
and a short or small instrument gives us a
high-frequency with a high pitch.
These pipes are a great example of how wind instruments work, but
what about string instruments? Let's go over
here to find out!
With a string instrument, the string vibrates to create a sound
This exhibit helps us to understand how a string vibrates.
Normally the string would vibrate too fast for us to see
but what happens when we spin the drum?
so how does this work?
well the black cylinder behind has
white strips running down it
we can't really see the black string
infront of the black cylinder, but
as the white strips go by
this gives us little snap shots of the
string movement. When our brains put these snap shots together
it gives us the effect slowing down the strings movement, showing us how the string
really moves.
so how does this relate to string
instruments?
Let's take a look at a guitar.
When i pluck the string, the string vibrates.
How do guitars make different sounds?
well if i pluck the open string
like this we get this sound, but if I press here
this halves the length of the string, which doubles the frequency, creating a higher sound
By pressing the string in different places, this changes the length of the string, which
changes the frequency
giving us different sounds.
and today we're going to think about the
question: how does an instrument make a sound?
To answer this question we first need to find out what sound is
Sound is caused by vibrations
that travel through the air and other materials to reach our ears
I can demonstrate using these pipes. By hitting the end of the tube
air is forced through the tube which causes the column of air inside the tube to vibrate
you may have noticed that we just heard
different types of sound. We hear these
different types of sound because of the number of vibrations.
We called the number of times something vibrates
in one second its Frequency, and we measure it in Hertz.
So if something vibrates 3 times in one second
its frequency is 3Hz
A long or big instrument creates a low frequency, giving us a low pitch.
and a short or small instrument gives us a
high-frequency with a high pitch.
These pipes are a great example of how wind instruments work, but
what about string instruments? Let's go over
here to find out!
With a string instrument, the string vibrates to create a sound
This exhibit helps us to understand how a string vibrates.
Normally the string would vibrate too fast for us to see
but what happens when we spin the drum?
so how does this work?
well the black cylinder behind has
white strips running down it
we can't really see the black string
infront of the black cylinder, but
as the white strips go by
this gives us little snap shots of the
string movement. When our brains put these snap shots together
it gives us the effect slowing down the strings movement, showing us how the string
really moves.
so how does this relate to string
instruments?
Let's take a look at a guitar.
When i pluck the string, the string vibrates.
How do guitars make different sounds?
well if i pluck the open string
like this we get this sound, but if I press here
this halves the length of the string, which doubles the frequency, creating a higher sound
By pressing the string in different places, this changes the length of the string, which
changes the frequency
giving us different sounds.
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Nov 24, 2024 Last updated |
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