I want to learn more about sound. Explain to me how sound travels, talk about why there is sound we can't hear, and also talk about pitch. Explain each topic in two or three sentences.
system
main dhwani ke bare main adhik jaananaa chahta hum.mujhe samajhaayen ki dhwani kaise yatra karti he, is bare main baat karen ki dhwani kyon he jise ham nahin sun sakate hai, or pich ke bare main bhi baat karte hai.prayek vishay ko do yaa teen vaakyon main bataaen.
user
dhwani tab banaai jaati he jab koi object kampan karata he, jisase hawa ke anu ek duusare main le jate hai or takaraa jate hai, jisase kampan hota he.anuon kii yah shrinkhalaa pratikriya he jise ham ek dhwani tarang kehete hai.

yadi kampan ek nishchit gati se aage bad rahe hai, to aap ise sun sakate hai, lekin aap kuch dhimi gati kii awaz nahin sun sakate hai jaise ki aapkaa haath hawa ke madhyam se dhire -dhire guzar rahaa he.aap jo sabase dhimi kampan sun sakate hai vah prati second 20 kampan he jo ek kam pich dhwani he, or sabase tej aap sun sakate hai ki 20,000 kampan prati second he jo ek ucch pich dhwani he.prati second kampan kii sankhya vah he jise ham object kii aavriti kehete hai jise hertz main mapa jaataa he.

ek dhwani kii pich wibratting object ke vajan par nirbhar karti he.adhik dravyaman, dhimi gati se yah kampan karata he, jiskaa arth he ek kam pich, or kam dravyaman, utana hi teji se kampan karata he, jiskaa arth he ek ucch pich.phir bhi object ke dravyaman kaa samaayojan, jaise ki ise pani se bharna, yaa object ke tanaav kaa samaayojan, jaise ki ek sangeet vaadyayantra ke string ko kasnaa, pich ko badal saktaa he.
assistant
<|system|>
</s>
<|user|>
main dhwani ke bare main adhik jaananaa chahta hum.mujhe samajhaayen ki dhwani kaise yatra karti he, is bare main baat karen ki dhwani kyon he jise ham nahin sun sakate hai, or pich ke bare main bhi baat karte hai.prayek vishay ko do yaa teen vaakyon main bataaen.</s>
<|assistant|>
dhwani tab banaai jaati he jab koi object kampan karata he, jisase hawa ke anu ek duusare main le jate hai or takaraa jate hai, jisase kampan hota he.anuon kii yah shrinkhalaa pratikriya he jise ham ek dhwani tarang kehete hai.

yadi kampan ek nishchit gati se aage bad rahe hai, to aap ise sun sakate hai, lekin aap kuch dhimi gati kii awaz nahin sun sakate hai jaise ki aapkaa haath hawa ke madhyam se dhire -dhire guzar rahaa he.aap jo sabase dhimi kampan sun sakate hai vah prati second 20 kampan he jo ek kam pich dhwani he, or sabase tej aap sun sakate hai ki 20,000 kampan prati second he jo ek ucch pich dhwani he.prati second kampan kii sankhya vah he jise ham object kii aavriti kehete hai jise hertz main mapa jaataa he.

ek dhwani kii pich wibratting object ke vajan par nirbhar karti he.adhik dravyaman, dhimi gati se yah kampan karata he, jiskaa arth he ek kam pich, or kam dravyaman, utana hi teji se kampan karata he, jiskaa arth he ek ucch pich.phir bhi object ke dravyaman kaa samaayojan, jaise ki ise pani se bharna, yaa object ke tanaav kaa samaayojan, jaise ki ek sangeet vaadyayantra ke string ko kasnaa, pich ko badal saktaa he.</s>
