The physical phenomena associated with the production, transmission of sound and its effects is called acoustic phenomena.
Musical Sound and Noise
The sound which gives pleasing effect to our ears is called musical sound. Music is pleasing to ear. It is due to the periodic and regular vibration. Wave form does not show sudden change in wavelength and amplitude. Frequency is generally high. It is for long duration.
Characteristics of Musical sound
Pitch: The pitch of the sound depends upon the frequency of vibration of air and relative motion between the sounding body and the listener. The sound with low frequency is identified as low pitch and high frequency is identified as high pitch. The high pitch sound is called shrill and low pitch sound is called grave of flat.
Loudness or intensity: The intensity I of the sound is defined as the amount of energy crossing per unit area per second and the amount of intensity determines the loudness of the sound. Factors determining the loudness of the sound:
Loudness of the sound depends upon:
Amplitude of sounding body: Greater the amplitude larger the intensity of sound.
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