Skip to main content

SOUND OF MUSIC

      


                     ADVT:  REFURBISHED MOBILES IN AMAZON

     When a bell is struck, it vibrates with a certain frequency (Number of vibrations per second).  The vibrating bell pushes the air molecules around it.  Hence air pressure variations are created with the same frequency.  These pressure variations travel as a sound wave and reach our ears.  The ears sense it. The brain interprets as a certain sound.

    Frequency is the main feature of sound and music. It is measured in Hertz-Hz. One Hertz is one vibration or one cycle per second.

    How the stringed musical instruments like the violin, the guitar produces music-sound of various frequencies?  Let us find out.

       Frequency of vibrating string = 1/2*length*(root of (tension/linear density)

      According to the formula, one can change the frequency in three ways. 1. tightening the string -tension changes 2. Using a thicker string -linear density 3. using fingers on frets - length changes.

    Mainly frequency is changed by changing the length of the string. Frequency is inversely proportional to the length of the string. If we halve the length of the string, the frequency will double.

    The frequency is easily changed by using fingers as shown in the figures.

     

       As the length of the vibrating string decreases, the frequency increases. 

        

               The seven basic musical notes and their frequencies are given below.

    do           SA               240

    re           Re                270

   mi           GA               300

   fa            ma               320

   soi           pa                360

    la           dha               400

   si             Ni                480 

Latin        Indian      Frequency Hz

                  By moving fingers on the strings, we can create sounds of various frequencies or musical notes. By combining musical notes rapidly, we can produce a composition- a melody, a symphony, a song. 

        Rainbow is an eye-candy. Basically, they are light waves. But each color has its own frequency. Similarly, a song is ear -candy. Basically, it is sound waves. But it is composed of various frequencies.  

--------------------------------------------------------------------------------

NOTE 1; We understand that low-frequency means long string. That is why low-frequency instruments like cello, the bass is larger than the violin.

NOTE 2:  women's voices have a higher frequency than men's.

NOTE 3: Higher frequencies which are multiples of the fundamental frequency are called harmonics or octaves.

NOTE 4: When we say "sa' the voice box in the throat vibrates at 240hz. When we say "Re' it vibrates at 270 Hz and so on.


Comments

Post a Comment

Popular posts from this blog

THE EARTH, A SUPER ORGANISM

     JOIN MY COURSE: "Become a programmer in a day with python"       A man called 'love lock' (what a name) proposed a theory called Gaia theory, named after Greek Goddess.      It says, "Earth is a self-regulating organism like a human being.  The organic life in it interacts with in-organic matter and maintains atmosphere, temperature and environment".  Hence the earth is still suitable for the life to thrive.      Imagine, in a particular place, there are lot of flowers.  Some flowers are white and some are darkly coloured.  We know, white reflects light and heat while dark absorbs the same.  White flowers can thrive in hot climate.  But dark flowers requires cold climate.  The absorption and reflection balances and the environment reaches average, warm temperature at which both the flowers can co-exist.  This is the essence of "Gaia" theory.      On our earth, the oxygen constitute 20% of the atmosphere.  The oxygen level is always mai
3 comments
Read more

THE PARABOLA

          A jet of water shooting from a hose pipe will follow a parabolic path.  What is the so special about parabola.    Y= x^2 Draw a graph for the above equation.  It will result in a parabola.  This parabola is also called unit parabola.  Any equation involving square will yield a parabola. Example:  Y = 2x^2 +3x+3 (also called quadratic equation)    X= 2 and -2, both  satisfies the equation 4 = X^2.  Parabolic equations always have two solutions.     Any motion taking place freely under gravity follows parabolic path. Examples:   An object dropped from a moving train,   A bomb dropped from flying plane,  A ball kicked upwards.      If a beam of light rays fall on the parabolic shaped mirror, they will be reflected and brought to focus on a point.  This fact is made use of in Dish Antenna, Telescope mirrors, etc.      Inverted parabola shape is used in the construction of buildings and bridges.  Because the shape is able to bear more weight.      A plane
Post a Comment
Read more

DISORDER IS THE "ORDER OF THE DAY"

         Imagine a balloon full of air.  The air molecules are moving randomly inside the balloon.  Let us pierce the balloon with a pin.  The air rushes out.  Why should not the air molecules stay inside the balloon safely and ignore the little hole?  That is not the way the world works.  The molecules always "want to occupy as many states as possible".  Hence the air goes out in the open to occupy more volume.   The things always goes into disorder (entropy) and the disorder increases with time.  The above statement is what we call "second law of thermodynamics".      Consider a cup of coffee on the table. Suppose the heat from entire room flows to your cup of coffee, the coffee will boil and the rest of the room will freeze.  Freezing means bringing things to order and arrangement.  It violates the second law.  Hence it will never happen.  Hence heat must flow from high temperature to low temperature and not the other way.        The air molecules in y
Post a Comment
Read more