Sound Chapter 47.

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Presentation transcript:

Sound Chapter 47

Sound Sound is a form of energy. Sound is caused by objects vibrating. Example Tuning Fork, Guitar String

Sound Sound needs a medium to travel. Sound cannot travel in a vacuum. Eg Air, Water, Solids. Sound cannot travel in a vacuum.

Reflection of Sound Sound bounces back of solid surfaces this called an echo. Bats use this principle to avoid obstacles.

Ultrasound Ultrasound is a very high pitched sound (Note/Frequency) which cannot be detected by human ears. Uses of Ultrasound: Ships detecting depth Medicine (viewing embryos)

Speed of Sound Sound travels in air at 340m/s. Sound travels faster in water (1,400m/s) and fastest in solids (5,000m/s). Light is a lot faster than sound it travels at 300,000,000m/s.

Measuring Sound Sound is measured in decibels (dB). 0 is the lowest sound that can be heard, anything above 85dB is dangerous for our ears. Protection for ears must be worn when working with loud machinery