UNIT 4: THE SOUND

LO QUE TENGO QUE SABER DE ESTE TEMA

1) Conocer el concepto de frecuencia, así como el rango de frecuencias de producción del sonido.

2)Entender la naturaleza ondulatoria del sonido.3)Explicar fenómenos naturales referidos a la transmisión del sonido.4)Resolver problemas relativos a la velocidad de propagación del

sonido en el aire.5)Comprender y resolver ejercicios sencillos sobre la producción del eco.6)Conocer los efectos perjudiciales del ruido y valorar las actitudes de

prevención de la contaminación acústica, proponiendo medidas correctoras para combatirla.

VIDEO: WHAT IS SOUND https://www.youtube.com/watch?v=27a26e2CnuM

Sound is a mechanical wave which travels through a medium from one location to another. This motion through a medium occurs as one particle of the medium interacts with its neighboring particle, transmitting the mechanical motion and corresponding energy to it. This transport of mechanical energy through a medium by particle interaction is what makes a sound wave a mechanical wave.

PRESENTACIÓN COMO SE PRODUCE SONIDO: http://www.wikisaber.es/Contenidos/LObjects/sound_vibrations/index.html

SOUND IS A WAVE

Sound are vibrations that can travel through different materials.

Sound travels through air or other material such as stone, water, glass and brick.

Sound cannot travel through a vacuum because there is nothing to vibrate. Sound needs a medium to be transfered.

Propagation velocity of sound in different medium.

Medium Velocity

Rubber

Air

Air vapour

Sea water

Concrete

Copper

Glass

Steel

VIDEO: HOW THE EAR WORKS.

Echoes are sound waves bouncing off surfaces.

The echo is usually quieter than the original noise as energy is lost as the wave travels along.

Echolocation• Echolocation is a process of detecting and locating objects by sending out sound waves and hearing the echoes that return from the objects.• This is used in order to “see” rather than to communicate.

ECHO AND REVERBERATION

Distance = Speed x Time

VIDEO: ECHOES AND DOLPHINS

VIDEO: ECHO AND DOLPHINS

VIDEO: CONTAMINACIÓN ACÚSTICA Y ANIMALES MARINOS

STORY TELLING: what happens when you really listen