MCS-CLASS 9 PHYSICS

Home Work:                   Chapter SOUND                       27th April,2020                 Dear Students, I hope you have completed the notes given to  you in the last blog. I am giving you work to be done in continuation . Characteristics of Sound : 1.Pitch  2. Loudness  3.Quality As discussed in class along with appropriate graphs. Q1.  State the two laws of reflection of sound. Q2.  Distinguish between loudness and intensity of Sound?                        Q3. What is Echo? How can you calculate the time of Echo?                    Q4. What is Reverberation?How can it be reduced?                      ...

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. 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 S...