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a) Sound cannot travel through vacuum because there is no medium for the sound to travel, Inside the air tight jar he was able to hear the bell ,but when his teacher sucked the air out of it then there was no medium for the sound to travel hat's why Nawaz was unable to hear the sound
b) The air travels faster through water than through air because there are less number of molecules of air in the atmosphere in a certain area, Where as in water there are more molecules in a certain area