MCS-PHYSICS-9B


Home work:                   Chapter SOUND                       18th April,2020                
Dear Students,

I hope you have completed the first homework. I am giving you notes which have to be done in continuation to the previous homework.

Characteristics of Sound wave.

1. Compressions and Rarefactions : 
Compressions are the regions where medium particles are crowded together and the density as well as pressure are high. On the other hand Rarefactions are the regions where medium particles are spread apart and the density as well as pressure are low.

Compressions and Rarefactions in Sound Wave - Class 9 Science Notes

2. Amplitude :
  • The magnitude of maximum disturbance (pressure or density) in the medium on either side of the mean value is called amplitude of sound wave.
  • Amplitude is usually represented by the symbol A. 
  • The SI unit of Amplitude of sound is Metre(m).
3. Wavelength :
  • The Distance between two consecutive compressions or two consecutive Rarefactions is called Wavelength.
  • It is usually represented by the Greek letter (lambda) λ.
  • the SI unit of Wavelength is Metre(m).
4. Frequency :
  • The number of oscillations completed per unit time by the Sound is called its Frequency.
  • It is represented by a Greek letter (Nu) v, it can also be represented by f.
  • The SI unit is hertz(Hz)
5. Time period:
  • Time taken between two consecutive compressions or rarefactions crossing a point is called time period of the Wave.
  • It is represented by T. 
  • The SI unit of time period is seconds(s).
6. Relation between frequency and time period of a wave
  • If T  be time period of a wave then as per definition of time period,                  No. of oscillations completed in time T = 1.                                            No. of oscillations completed in unit time = 1/T.                      But the number of oscillations completed by a wave per unit time = frequency of a wave,                                                                                          Thus,               f = 1/T  
7. Wave speed
  • The wave speed is defined as the distance which a point on the wave, such as a compression or a rarefaction, travels per unit time. 
  • It is represented by v.
  • The SI unit of the wave speed is m/s.

Comments

  1. MeetuMarch 31, 2020 at 12:51 AM

    Noted ma'am Saahir Nagpal

    ReplyDelete
  2. UnknownMarch 31, 2020 at 12:55 AM

    Okay, thank you ma'am, Rhea Gupta

    ReplyDelete
  3. metroreaderMarch 31, 2020 at 1:07 AM

    This comment has been removed by the author.

    ReplyDelete
  4. AnonymousMarch 31, 2020 at 1:10 AM

    Thanks ma'am, Nandita Thakur

    ReplyDelete
  5. UnknownMarch 31, 2020 at 1:17 AM

    Thanks ma'am, Ishika

    ReplyDelete
  6. UnknownMarch 31, 2020 at 1:19 AM

    Ok ma'am, thank you
    Nishtha Sharma

    ReplyDelete
  7. Daksh SharmaMarch 31, 2020 at 1:19 AM

    Thanks ma'am,Daksh Sharma 9-B

    ReplyDelete
  8. UnknownMarch 31, 2020 at 1:20 AM

    Thank you ma'am, Aditya Bahl (Class 9B)

    ReplyDelete
  9. UnknownMarch 31, 2020 at 1:25 AM

    Thank you ma'am, Samyukta lingwal

    ReplyDelete
  10. BismeetMarch 31, 2020 at 1:34 AM

    Thank you ma'am, (Bismeet Kaur 9B)

    ReplyDelete
  11. UnknownMarch 31, 2020 at 1:46 AM

    Thank you ma'am, Tithi Chaturvedi

    ReplyDelete
  12. UnknownMarch 31, 2020 at 2:10 AM

    Thank you ma'am Advitya kumar class IX B

    ReplyDelete
  13. UnknownMarch 31, 2020 at 2:22 AM

    Okay mam Stuti

    ReplyDelete
  14. UnknownMarch 31, 2020 at 3:10 AM

    Okay maam pari

    ReplyDelete
  15. Divija BhardwajMarch 31, 2020 at 6:51 AM

    Thank you ma'am, Divija Bhardwaj
    (9-B)

    ReplyDelete
  16. Divija BhardwajMarch 31, 2020 at 6:51 AM

    This comment has been removed by the author.

    ReplyDelete
  17. UnknownMarch 31, 2020 at 7:24 PM

    Ok ma'am thankyouu
    Diya goel

    ReplyDelete
  18. UnknownApril 9, 2020 at 10:48 PM

    Thank you ma'am,
    Samyukta lingwal

    ReplyDelete
  19. Kshitij dasariApril 13, 2020 at 6:16 AM

    Thank you ma'am

    ReplyDelete
  20. UnknownApril 19, 2020 at 8:36 AM

    Maam done
    Gursimar Singh IX B

    ReplyDelete
  21. SaatvikApril 23, 2020 at 12:10 AM

    Thank You Ma'am
    Saatvik IX-B

    ReplyDelete
  22. SaatvikApril 23, 2020 at 12:10 AM

    Thank You Ma'am
    Saatvik IX-B

    ReplyDelete

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