Points to Remember

Acoustics - Science

Points to Remember

·                 Wave velocity is the velocity with which the wave travels through the medium.

·                 Velocity of a sound wave is maximum in solids because they are more elastic in nature than liquids and gases. Since gases are least elastic in nature.

·                 Infrasonic waves are sound wave with a frequency below 20 Hz. A human ear cannot hear these waves.

·                 Ultrasonic waves are sound waves with frequency greater than 20 kHz, A human ear cannot detect these waves.

·                 Reflection of sound waves obey the laws of reflection.

·                 when a compression hits the boundary of a rarer medium, it is reflected as a rarefaction.

·                 An echo is the sound reproduced due to the reflection of the original sound wave.

·                 The minimum distance between the source and the reflecting surface should be 17.2 m to hear an echo clearly.

·                 “The apparent frequency” is the frequency of the sound as heard by the listener.