This Science quiz is called 'Sound 1' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.
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When you hear a sound your ear is picking up a vibration in the air. The energy from the vibration travels in waves - when these waves travel to your ears and then to your brain, you hear the sound. When someone plays a guitar, you can see the vibrating strings and hear the sounds they produce - low, medium and high pitch. It's not just air that can carry sound waves - in fact, solids are the best medium for transmitting sound and liquids are also better at it than air is! Sound can also bounce off solids - when this happens we hear an echo. An echo is a reflection of a sound wave.
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Sound can travel through anything that can vibrate - this is described as the 'transmission' of sound
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The ear drum makes three tiny bones move and these pass the vibrations on to the cochlea. The cochlea sends signals to the brain which we hear as sound
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High frequency vibrations make high pitched sounds and low frequency vibrations make low pitched sounds
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Large, thick, or loose strings also produce a lower pitch, as do longer instruments or strings
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1 Hertz = 1 vibration per second
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Sounds above 85 decibels can damage your ears - concerts, loud MP3s and motorbikes all reach levels higher than this
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Have you ever heard your voice echo? Large, empty rooms, such as in a cathedral, are great places for echoes
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Soft, flexible, fibrous materials can often absorb sound - these materials are good for soundproofing
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Light travels faster than sound - 874,000 times faster!
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The shorter you make the string (by pressing your finger against it), the higher pitch you will hear when you pluck the string
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