Sound is described as disturbance in a medium. So even if there is no one to hear it at that moment, there will be evidence of the fact for any future observer and it can be called as sound.
There are many trees in my garden. One such tree is a mango tree and obviously, there are some mangoes on it. Using the Slingshot I try to get some mangoes. After half an hour there are no mangoes on trees and no mangoes with me.
How come?
I am a 4 digit number My 1st digit is of no use as I still remain same without it. My 2nd and 3rd digits are mirror images. My 4th digit are half of 2nd. Can you guess the number ?
