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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

The air particles propelled by the stroke hit against other unagitated air particles and produce compressions and expansions on all sides. These compressions and expansions subsist as long as the impetus lasts. Since air cannot be directly perceived these compressions and expansions are not visible. Śabda is heard only as long as these compressions and expansions do not cease, but not after they cease. . . . This is the reason Śabda is heard for longer distances downwind.

The air particles propelled by the stroke hit against other unagitated air particles and produce compressions and expansions on all sides. These compressions and expansions subsist as long as the impetus lasts. Since air cannot be directly perceived these compressions and expansions are not visible. Śabda is heard only as long as these compressions and expansions do not cease, but not after they cease. . . . This is the reason Śabda is heard for longer distances downwind.

[[File:Compression and Rarefaction.PNG|thumb|600.234x600.234px|Demonstration of Transverse propagation of sound waves by alternating compressions and rarefactions]]

[[File:Compression and Rarefaction.PNG|thumb|Demonstration of Transverse propagation of sound waves by alternating compressions and rarefactions]]

An extract is given from a modern textbook (Singh, Singh Sardar. Longman science Physics 9. New Delhi: DK Publishers, 2009. pp. 107, 108), with the Sanskrit text from Śābarabhāṣya (अभिघातेन हि प्रेरिता वायवस्तिमितानि वाय्वन्तराणि प्रतिबाधमानाः सर्वतोदिक्कान् संयोगविभागानुत्पादयन्ति।) superimposed on the text at appropriate places.

An extract is given from a modern textbook (Singh, Singh Sardar. Longman science Physics 9. New Delhi: DK Publishers, 2009. pp. 107, 108), with the Sanskrit text from Śābarabhāṣya (अभिघातेन हि प्रेरिता वायवस्तिमितानि वाय्वन्तराणि प्रतिबाधमानाः सर्वतोदिक्कान् संयोगविभागानुत्पादयन्ति।) superimposed on the text at appropriate places.

# Consider the original position of layers of air when no sound wave exists (Fig. 5.2(a)).

# Consider the original position of layers of air when no sound wave exists (Fig. 5.2(a)).

== References ==

== References ==

[[Category:Shastras]]

[[Category:Shastras]]