Timestamps 00:08 - Exploring the properties and origins of sound. 01:00 - Introduction to the Sound chapter with farewell to students. 02:28 - Overview of the Sound chapter and its examination pattern. 03:12 - Understanding sound and its effects on communication. 04:33 - Sound is a form of waves created in the atmosphere. 05:16 - Particles in gases move due to applied force. 06:33 - Particles appear to move away while actually oscillating. 07:09 - Sound waves oscillate particles without horizontal movement. 08:33 - Vibration in particles transfers energy through force. 09:14 - Sound is energy that travels through vibrations. 10:58 - Sound is a wave, a disturbance that transfers energy through a medium. 11:40 - Waves transfer energy from one place to another. 13:25 - Sound travels in waves while particles vibrate in specific directions. 14:08 - Understanding longitudinal and transverse waves. 15:53 - Understanding longitudinal and transverse waves and their definitions. 17:04 - Direction of wave propagation affects particle vibration. 19:12 - Waves need a medium to travel. 20:05 - Understanding non-mechanical waves, specifically light and sound waves. 21:57 - Introduction to sound waves as mechanical waves. 22:59 - Exploration of classroom sounds and their impact. 25:04 - Understanding vibrations and sound characteristics based on force and particle movement. 25:51 - Understanding sound wave propagation through particle movement. 27:14 - Understanding compression and rarefaction in sound waves. 27:58 - Graphical representation of sound compression and rarefaction. 29:34 - Comparison of graphs to understand sound properties. 30:39 - Understanding sound vibrations and their impact on voice intensity. 32:38 - Understanding vibration and frequency in sound. 33:23 - Understanding sound concepts through practical examples and graphs. 35:17 - Understanding wave propagation: mechanical vs non-mechanical waves. 36:07 - Sound requires a medium to travel; no medium means no sound. 38:23 - Understanding complete vibrations through graphical representation. 39:13 - Understanding pressure and distance in wave behavior. 41:07 - Amplitude determines the loudness of sound in waves. 41:55 - वेव लेंथ और फ्रीक्वेंसी के बीच संबंध समझाना। 43:27 - Understanding frequency and time period in wave mechanics. 44:17 - Understanding the relationship between frequency and amplitude in sound waves. 45:52 - Velocity and wavelength concepts are linked through formulas in wave mechanics. 46:35 - Understanding sound concepts like frequency and pitch. 48:13 - Understanding sound characteristics: loudness and quality. 48:59 - Ninth grade is often underestimated by students due to lack of exam pressure. 50:13 - Understanding sound quality and timbre through distinct characteristics. 51:06 - Sound intensity relates to energy concentration in a given space. 52:54 - Understanding sound waves and their properties. 54:02 - Understanding wave velocity calculation using distance and time. 55:45 - Understanding sound frequency and pitch differences. 56:45 - Sound characteristics vary by source and frequency. 58:26 - Understanding wave behavior and timing in sound propagation. 59:23 - Sound travels at different speeds in various media. 1:00:48 - Sound reflection principles explained through light concepts. 1:01:32 - आंगल ऑफ इंसीडेंस और रिफ्लेक्शन समान होते हैं। 1:02:57 - Sound reflection occurs in empty spaces, creating echoes. 1:03:43 - Echo occurs when sound reflects off surfaces at a distance. 1:05:20 - Understanding distance calculation using speed and time. 1:06:28 - Sound reflects multiple times in an empty room. 1:07:46 - Understanding multiple reflections and managing sound reverberation. 1:08:21 - Acoustic materials improve sound quality in auditoriums. 1:09:47 - Human hearing range is 20 Hz to 20,000 Hz. 1:10:56 - Understanding infrasound and ultrasound's applications and benefits. 1:12:11 - Understanding sound and sonar in detecting imperfections. 1:12:55 - साउंड नेविगेशन में सोनार की भूमिका समझाई गई है। 1:15:11 - Understanding ultrasound speed and distance calculations. 1:16:14 - Connecting with students through Telegram for continued learning. 1:18:00 - Key characteristics of sound waves and their properties. 1:18:52 - Key formulas for sound and hearing range in Class 9 Science. 1:20:41 - Students express appreciation and discuss connection with the teacher.
(\_/) LOTS OF LOVE SIR ❤❤ ( •.• ) next batch main milte hai. >❤ so its for you: mere dil main jagah kuda ki khali thi dekha whaa pai aaj tera chera hai🥰🥰 Main batakta hua sa ek badal hu jo tere aasma pe aaake thera hai.🫡 Jaane toh hum bhi nahi denge🥺 Rinky promise!
Sir aapke liye kuchh:- hmm.. chood ke kyu gaye aajnabi ki tarah......😢 Girte inn aasuo me kuchh to tujhsa lage hai... Because sir you are the only teacher with whom I shared my doubts, problems and you helped me that how to solve it and last me bye sir I hope we will meet soon 💗🙂
21:42 sir ab kab milogai ham logo ko i'm from neev pw 😭😭😭😭😭😭😭😭😭😭😭😭🤬😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭🤬😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😢😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭
Thank u sar aapane bahut jaldi syllabus khatm Kar Diya 31 /1 /25se mera exam bhi hai pahla exam science ka hai sir ager real life mein mil gaya na to sar Meri taraf Se pyari Si 💋💋💋
Download FREE PYQs: bit.ly/Race2025ForClass9th
Notes: t.me/pwneevclass9
Timestamps
00:08 - Exploring the properties and origins of sound.
01:00 - Introduction to the Sound chapter with farewell to students.
02:28 - Overview of the Sound chapter and its examination pattern.
03:12 - Understanding sound and its effects on communication.
04:33 - Sound is a form of waves created in the atmosphere.
05:16 - Particles in gases move due to applied force.
06:33 - Particles appear to move away while actually oscillating.
07:09 - Sound waves oscillate particles without horizontal movement.
08:33 - Vibration in particles transfers energy through force.
09:14 - Sound is energy that travels through vibrations.
10:58 - Sound is a wave, a disturbance that transfers energy through a medium.
11:40 - Waves transfer energy from one place to another.
13:25 - Sound travels in waves while particles vibrate in specific directions.
14:08 - Understanding longitudinal and transverse waves.
15:53 - Understanding longitudinal and transverse waves and their definitions.
17:04 - Direction of wave propagation affects particle vibration.
19:12 - Waves need a medium to travel.
20:05 - Understanding non-mechanical waves, specifically light and sound waves.
21:57 - Introduction to sound waves as mechanical waves.
22:59 - Exploration of classroom sounds and their impact.
25:04 - Understanding vibrations and sound characteristics based on force and particle movement.
25:51 - Understanding sound wave propagation through particle movement.
27:14 - Understanding compression and rarefaction in sound waves.
27:58 - Graphical representation of sound compression and rarefaction.
29:34 - Comparison of graphs to understand sound properties.
30:39 - Understanding sound vibrations and their impact on voice intensity.
32:38 - Understanding vibration and frequency in sound.
33:23 - Understanding sound concepts through practical examples and graphs.
35:17 - Understanding wave propagation: mechanical vs non-mechanical waves.
36:07 - Sound requires a medium to travel; no medium means no sound.
38:23 - Understanding complete vibrations through graphical representation.
39:13 - Understanding pressure and distance in wave behavior.
41:07 - Amplitude determines the loudness of sound in waves.
41:55 - वेव लेंथ और फ्रीक्वेंसी के बीच संबंध समझाना।
43:27 - Understanding frequency and time period in wave mechanics.
44:17 - Understanding the relationship between frequency and amplitude in sound waves.
45:52 - Velocity and wavelength concepts are linked through formulas in wave mechanics.
46:35 - Understanding sound concepts like frequency and pitch.
48:13 - Understanding sound characteristics: loudness and quality.
48:59 - Ninth grade is often underestimated by students due to lack of exam pressure.
50:13 - Understanding sound quality and timbre through distinct characteristics.
51:06 - Sound intensity relates to energy concentration in a given space.
52:54 - Understanding sound waves and their properties.
54:02 - Understanding wave velocity calculation using distance and time.
55:45 - Understanding sound frequency and pitch differences.
56:45 - Sound characteristics vary by source and frequency.
58:26 - Understanding wave behavior and timing in sound propagation.
59:23 - Sound travels at different speeds in various media.
1:00:48 - Sound reflection principles explained through light concepts.
1:01:32 - आंगल ऑफ इंसीडेंस और रिफ्लेक्शन समान होते हैं।
1:02:57 - Sound reflection occurs in empty spaces, creating echoes.
1:03:43 - Echo occurs when sound reflects off surfaces at a distance.
1:05:20 - Understanding distance calculation using speed and time.
1:06:28 - Sound reflects multiple times in an empty room.
1:07:46 - Understanding multiple reflections and managing sound reverberation.
1:08:21 - Acoustic materials improve sound quality in auditoriums.
1:09:47 - Human hearing range is 20 Hz to 20,000 Hz.
1:10:56 - Understanding infrasound and ultrasound's applications and benefits.
1:12:11 - Understanding sound and sonar in detecting imperfections.
1:12:55 - साउंड नेविगेशन में सोनार की भूमिका समझाई गई है।
1:15:11 - Understanding ultrasound speed and distance calculations.
1:16:14 - Connecting with students through Telegram for continued learning.
1:18:00 - Key characteristics of sound waves and their properties.
1:18:52 - Key formulas for sound and hearing range in Class 9 Science.
1:20:41 - Students express appreciation and discuss connection with the teacher.
🙃
Rakshak sir op ❤❤❤❤ no doubt
But this new sir in my opinion is
King 👑👑👑👑👑👑👑👑👑❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤ I want more lecture and marathon from ayush tyagi sir
Bhai akshay tyagi name ha ayush tyagi nahi
@YuvrajYadav-of2gv thank bro batane ke liye
24 january ko kon dekh raha hai
Good luck boss
Just like me at 8 'o' clock
Main dekh raha hun gadhvi
Mai
Main
I am from neev 2025 😇 all teacher of pw is best😇😇😊
Yess 🥰🥰🥰
😂😂😂😂😂😂😂😂 judva
@@Nafisha-e3gek friend ke waste aap se puch raha hu please tell me
@@Nafisha-e3gwo he to nhi ho Raha hai kuch to khasiyat ho gi na ladkiyo ki jisse me pta kar saku aap to jante honge n
@@Nafisha-e3gto batao na kuch to hoga na jisse me samajh saku
Sir your teaching style is best ❤❤
Bhai starting me rope Wale example mein haath to ek dum dancer wala hilaya hai .Pakka teacher hi ho na ki singer ya dancer bhi😂
All the best for annual exams😊
42:31
22:45 22:47 22:47 22:47 😅😅😅😅😅😅😅
Sir stream wala se acha side and long video banaye plz isme samajh to aaya lekin defination yaad or samaj nahi aa raha
(\_/) LOTS OF LOVE SIR ❤❤ ( •.• ) next batch main milte hai. >❤ so its for you:
mere dil main jagah kuda ki khali thi dekha whaa pai aaj tera chera hai🥰🥰
Main batakta hua sa ek badal hu jo tere aasma pe aaake thera hai.🫡
Jaane toh hum bhi nahi denge🥺
Rinky promise!
Sir you are the best teacher in my life 💝
23:30 😂😂😅
Sir aapke liye kuchh:- hmm.. chood ke kyu gaye aajnabi ki tarah......😢 Girte inn aasuo me kuchh to tujhsa lage hai... Because sir you are the only teacher with whom I shared my doubts, problems and you helped me that how to solve it and last me bye sir I hope we will meet soon 💗🙂
21:42 sir ab kab milogai ham logo ko i'm from neev pw 😭😭😭😭😭😭😭😭😭😭😭😭🤬😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭🤬😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😢😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭
24:15 😂😂😂😂😂😂 rinki mam ki aavaj 😂😂
31st jan ❤
Me also bhai exact at 10:00 pm 51:33
Mai pahli bar padh raha hoo lekin achchhe se samajh aa raha jai
Jo subscribe nahi kiya to 9 class final exam ma pakka fail don't risk ☠️........
👇
Fail ho jauga chalega par like to nhi karuga 😂😂
Jo like kiya isko Gareeb ko uske 10000000 baap
Tumhare khne se koi fail ho jaiga
Bhai ap nahi fail ho jana baki ka rehna doo
@@Dark_king_17 all right 👍
Yes sir feeling aa gyi
Kon 5 febuary mai aaya hai
No fear for test pw teachers are best 😅
Sir ji your AT ❤😢
this series is really helpful
thanks PW
Electrifying & spectacular
U know one thing I love ur name 😍💗
This is not for impress u this is reality
And I have also subscribed ur channel@@Ishika_incredible
1:13 1:13 1:13
What a explanation!!!!! ❤ thank u sir
Voice changer ☠️💀
Kya gajab ka पढ़ाया है यार😮😮
Topper+backbenchers attendence here 🎉😈
Thanks you sir ❤
Sir you are great ❤
*To all my juniors of 2026 - 9 Batch, All the Best for Your Exams.*
*PHOD DENA EKDAM* 🔥
Very nice explanation thanksyou sir ❤
Nice sir 👌 😊❤❤❤❤❤❤😊😊😊😊😊😊😊😊😊
Thanks sir ❤🥺🥺 I miss u a lot ❤ 🥺
45:34 ❤❤
Sir please take my question reply 🙏
Sir , if we produce sound energy in space or vacuum so where sound energy goes ?????????
We can not produce it there is no medium if there is not a farm how will milk produce
Thank you so much sir nice class class end 😭
Hey
Today is 1 February, one step away from exam😂😂😂
Sir aap ko to specifically sound hi padhana chahiye 😊 talent of changing voice 😉😁
race batch me bhi sound upload ho gya but rakshak sir ka lecture upload nahi ho raha??????????
35:30 but sir legend are watching at 2x speed they didn't know difference 😅
26 January 🎉🎉🎉
First comment
Anything
Chalna 12:40
1st comment like for sir back in class10
21:24 sound ek dum mosquito k tarah lag rha hai naaki train ki😂😂
🤣🤣
Thanks sir for studying this sound chapter 😊❤
sir thankyou mujhe bahut yaad aa rahi thi aapki kyuki aap ne video late me upload kiya na
Superb explanation sir 😊
Jai shree Krishna 🌺🌹🌹🌺😊
Sir aapki voice wah sir
I think it was most of the easiest chapter of physics In class 9th .
10:23
!doubt
sir magar moon par too soil hoti ha aur sool bhi particle haa ????????????????
What a teaching style❤❤
21:11 mai😊
Kon kon end tak tha
33:34 🤌🏻👍🏻
Byyyyyy❤❤❤❤❤❤
Thank u sar aapane bahut jaldi syllabus khatm Kar Diya 31 /1 /25se mera exam bhi hai pahla exam science ka hai sir ager real life mein mil gaya na to sar Meri taraf Se pyari Si 💋💋💋
Thank you sir
Aap se padh ke bahut accha laga
Sir aap ka voice bahut jyada unique hai
Jisne padha hai vo hi pass hoga😅
25:12😂😂😂
Kis kis ka 27 ko paper ha 😂
Thank sir❤
Very good explanation
Sir aap aapki Madhur aavaje ko mat taklif do🤣🤣
24:14 voice change 💀💀
Thank you and byee sir
Legend😅 hain sir 😇
😤
Me fast class sir 🎉
🧑💻🧑💻🧑💻🧑💻
❤
Kasam se sir aapne to fil kara diya
Thank you so much sir 😊
🤗🤗
I am 1st student
Sir's sound at 1.5x like shahrukh khan
😅😅
Bye sir,lets meet after 2 months 😊😊😊
Dekh lene likh ke de rhi hu .....ab 100% Wale bikhari aayenge ......bikh mangne..........😂😂😂
Thankyou so much sir❤
Sir marathon hoga
Sir marathon mein jarur aayega ❤❤❤❤❤❤❤❤❤❤❤❤❤❤
Last 😢😢😢
@@Nafisha-e3gTaalre maaa ka 😮
Itne handsome teacher h 😍
Why sir is so underated????
I am very happy because (tube sensei) channel ke bhaiya ka 27 January ko face reveal hoga
Nice sir thank you
Aaj kaun kaun dekh raha hai🎉🎉
❤❤❤❤❤❤❤at
❤❤❤❤❤❤❤❤❤😂❤❤❤❤❤❤❤❤❤
bye sir 🥺🥺
🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤🖤
Acha ek bat batao 26 January kitne tarikh ko hai dosto 😂😂
Hmm dii😅😅
😅😅
32 😂😂
❤❤❤❤
Me bhi
😢😢😢😢😢😢😢😢😢😢😢😢
Good evening sir
Sir multi talented hai
Hello sir
😢😢😢 miss you sir............