Sound

Presentation by Language Assistant – Liannette Bellido Cintrón Natural Sciences 2˚ ESO I.E.S. Francisco Rodríguez Marín– OSUNA, Seville JANUARY 2011

What is sound? ,[object Object],[object Object],[object Object],[object Object],[object Object]

How is sound made? ,[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object]

Sound needs a medium for propagation ,[object Object],[object Object],[object Object]

If you could play the guitar in the Moon would it produce any sound? NO. Because there is no air in the Moon, and sound needs a medium of propagation.

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Speed of Sound ,[object Object],[object Object]

Pitch ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Loudness ,[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object]

The scale begins on the softest sound that a person can hear. This is called the threshold of hearing. ,[object Object]

“ Timbre” (TAM-ber) or tone color ,[object Object]

Reflection of sound ,[object Object],[object Object],[object Object]

Noise pollution ,[object Object],[object Object],Scientists recommend avoiding exposure to noise higher than 65dB. To control noise pollution, governments have adopted various alternatives. Acoustic walls

Sound

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Editor's Notes