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Day 1:Sound Part 1 (in Hindi)
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This is a crash course for cds , Afcat and Nda examinations. Follow Nishant for cds awesome courses https://unacademy.com/user/nishantdahiyaa6-6764

Sikender
|Teaching From Past 3+ years||Cleared multiple exams of SSC, CDs, Afcat| |For Study Material visit cdscrack.in|

U
Unacademy user
toughest element - diamond
sir how to join you on whatsapp.. plzz guide me
Sir, please try to complete this course unlike other courses which are being left in between
Sikender
2 years ago
You can join me on whatapps also
Rashi Tanwar
2 years ago
9166604469 .....please add me
sequence me kyu nhi padha rhe h.. ie ek subject ke topic Ko khatm karke dushre topic Ko start karo...
sir Jo apne 30 days study plan banaya hai cds ka use follow kare ya ise kyuki usme apne different strategy batayi hai aur isme ap different topics ki video upload kar Rahe ho Jo usme mention nahi??
hello sir can you tell me please how to cover science section for CDS exams actually I am from commerce background so I am finding difficulty to cover science portion
Sikender
2 years ago
Msg me on app
Same problem with me i am also from commerce background
  1. unacademy


  2. va 66 It requires persistence and hard work to achieve any goal. I am so happy to receive the honour,


  3. 30-DAY RSE


  4. F Chttps//unacademy.com/user/nishantdahiyaa6-6764 unacademy HomePls sik Login Signup Nishant Follow Has qualified Upsc/CDs eachl ITeaching since 2017IEngineerl 363 Views in last 30 days N 364 Lifetime Views Course 7 Followers 2 Following Ju By Nishant (Hindi) Trick to Solve Simple Interest 8 Lessons Open in app


  5. SOUND By Sikender



  6. By Sikender Dahiya . Sound is a form of energy and like all other energies, sound is not visible to us. It produces a sensation of hearing when it reaches our ears. Sound can not travel through vacuum. sound waves are longitudinal waves.


  7. By Sikender Dahiya . Sound travels as successive compressions and rarefactions in the medium. In sound propagation, it is the energy of the sound that travels and not the particles of the medium.


  8. WAVELENGTH The distance between two consecutive compressions or two consecutive rarefaction is called the wavelength. Compression. H. . Wavelenth Wavelength Rarefaction


  9. If You Realy Like this Video... Like Share Comment Thanks for watching