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Line 1: − {{ToBeEdited}} + − − − − In this article we discuss about the '''Science of Dhvani''' ('''ध्वनिविज्ञानम्)''', the physics of sound in ancient days in comparison with modern knowledge of the science of sound. It is to be noted that the siddhantas about the specialized subjects of origin of sound, the production of articulated words by humans vocal organs, the transmission of sound requires a medium, the wave theory for the propagation of sound - were explored and put forth much before the advent of modern experimental instruments and availability of specialized testing systems. + +
Origin and Propagation of Sound (शब्दोत्पत्तिः प्रसारश्च) (view source)
Revision as of 13:23, 18 May 2020
, 13:23, 18 May 2020no edit summary
Theories about the Origin and Propagation of Sound (Samskrit: शब्दोत्पत्तिः प्रसरणश्च) have well been discussed in many ancient texts of Bharatavarsha.
Theories about the Origin and Propagation of Sound (Samskrit: शब्दोत्पत्तिः प्रसरणश्च) have well been discussed in many ancient texts of Bharatavarsha.
* Sankhya siddhanta holds that the ear (श्रोतेन्द्रियं) travels to the source of sound and grasps the sound
* Sankhya siddhanta holds that the ear (श्रोतेन्द्रियं) travels to the source of sound and grasps the sound
* Nyaya and Vaiseshika systems put forth that sound travels like waves in Akasha (ether) and gets perceived in the ear (श्रोतेन्द्रियं).
* Nyaya and Vaiseshika systems put forth that sound travels like waves in Akasha (ether) and gets perceived in the ear (श्रोतेन्द्रियं).
* Mimamsakas held that vibrations of air particles which reach the ear-drum manifest Shabda and that these vibrations have a higher amplitude (called naada) when many people utter the shabda simultaneously. They also clarified that Shabda does not constitute of Vayu (air).
* Mimamsakas held that vibrations of air particles which reach the ear-drum manifest Shabda and that these vibrations have a higher amplitude (called naada) when many people utter the shabda simultaneously. They also clarified that Shabda does not constitute of Vayu (air).
Many modern findings have confirmed the above theories and we now study that sound is a form of energy which is transmitted by the vibration of particles in any medium.
Many modern findings have confirmed the above theories and we now study that sound is a form of energy which is transmitted by the vibration of particles in any medium.
== परिचयः ॥ Introduction ==
== परिचयः ॥ Introduction ==
Sound according to the modern physical science research is a form of very weak energy. It travels in space in wave form all round and within the ear space in the auditory canal. so if some sound is created, say by utterance or by the clink of a vessel or the ring of a bell, it travels all around in waves and enters the ear-space of one within reach. The sound waves are not audible by themselves. But when the sound-waves enter the ear-space the waves strike the walls of the ear and get deflected towards the diaphragm within, which is super sensitive to even mild waves and oscillates, thereby activating the motor nerves to transmit the message to the brain, where the message is converted into sound that we recognize. Here it is to be noted that the sound wave by itself is not audible; and does not produce sound. It is the resonance of air in a bounded space that produces sound. This is experimentally verified and demonstrated in classes. Every day, aeroplanes fly past us, but we do not hear them. But in a cloudy atmosphere, sound of the aeroplane flying by is heard clearly. The more cloudy the space, the louder will be the sound. Because in the bounded space, there will be reverberations, the clash of waves to and fro, that create the sound. The same principle works in the ear also.<ref>By S. R. Krishnamurthy ([https://groups.google.com/d/msg/bvparishat/A2Oucv-EarA/v_E0QA9e7hYJ B V P Post])</ref>
Sound according to the modern physical science research is a form of very weak energy. It travels in space in wave form all round and within the ear space in the auditory canal. so if some sound is created, say by utterance or by the clink of a vessel or the ring of a bell, it travels all around in waves and enters the ear-space of one within reach. The sound waves are not audible by themselves. But when the sound-waves enter the ear-space the waves strike the walls of the ear and get deflected towards the diaphragm within, which is super sensitive to even mild waves and oscillates, thereby activating the motor nerves to transmit the message to the brain, where the message is converted into sound that we recognize. Here it is to be noted that the sound wave by itself is not audible; and does not produce sound. It is the resonance of air in a bounded space that produces sound. This is experimentally verified and demonstrated in classes. Every day, aeroplanes fly past us, but we do not hear them. But in a cloudy atmosphere, sound of the aeroplane flying by is heard clearly. The more cloudy the space, the louder will be the sound. Because in the bounded space, there will be reverberations, the clash of waves to and fro, that create the sound. The same principle works in the ear also.<ref>By S. R. Krishnamurthy ([https://groups.google.com/d/msg/bvparishat/A2Oucv-EarA/v_E0QA9e7hYJ B V P Post])</ref>
In this article we discuss about the '''Science of Dhvani''' ('''ध्वनिविज्ञानम्)''', the physics of sound in ancient days in comparison with modern knowledge of the science of sound. It is to be noted that the siddhantas about the specialized subjects of origin of sound, the production of articulated words by humans vocal organs, the transmission of sound requiring a medium, the wave theory for the propagation of sound - were explored and put forth much before the advent of modern experimental instruments and availability of specialized testing systems.
==शब्दोत्पत्तिः ॥ Origin of Sound==
==शब्दोत्पत्तिः ॥ Origin of Sound==