The sensation of sound continues in our brain for about 0.1 s therefore, to hear a distinct echo sound, the time interval between the original sound and the reflected sound must be at least 0.1s.
If you shout or clap in a (especially) mountains region, after a while, you will hear the same sound, it is known as echo. When sound waves strike with a solid wall or even liquid, it gets reflected back. The shock waves produce a very sharp and loud sound, which is known as sonic boom. The shock waves carry a large amount of energy, which causes air pressure variation in its immediate environment. When a sound producing source itself moves with a speed higher than that of the sound, it produces the shock waves in air. For example, the speed of bullets, jet aircrafts, etc. When the speed of any object surpasses the speed of sound waves, the speed of respective object is known as supersonic speed. The following table illustrates the speed of sound in different media at 250 C − In any medium, if the temperature increases, the speed of sound also increases and vice versa.įor example, the speed of sound in air at 0 0C is 331 m s –1 and at 22 0C it is 344 m s –1. The speed of sound decreases when it passes from solid to gaseous state of a given medium. The speed of sound in a particular medium depends on temperature and pressure of that medium.
The speed of sound depends on the type and properties of the medium through which it is traveling. Physics Notes for UPSC IAS Prelims (Part I).
0 kommentar(er)
