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### 47 Cards in this Set

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 What does the pitch of a sound depend on? Pitch depends on how fast the source of the sound is vibrating. The faster the vibrations, the higher the pitch. pitch . A measure of how high or low it is. Which forms of matter can sound waves travel through? Sound waves can travel through gases, liquids and solids. What does loudness measure? Loudness measures the amount of sound energy reaching your ears. How can you change the pitch of a vibrating object? You can change the pitch of a vibrating object by changing the thickness or by changing the length of the material that vibrates. Why is there no sound in outer space? Sound travels through moving particles. In outer space there is no air (particles)for sound waves to travel through. speed of sound The speed at which a sound wave travels. Sound waves move at different speeds through different materials. What is the loudness of a sound? The loudness of a sound is a measure of the amount of sound energy reaching your ears. What does loudness depend on? The loudness of a sound depends on how far the vibrating object is moving as it goes back and forth. What happens to sound as it gets farther away from the object making the sound? As sound waves move away from their source, their energy is spread over a larger area. So the farther you are from the source of a sound, the softer the sound is. What is the pitch of a sound? The pitch of a sound is a measure of how high or low it is. sonic boom A sonic boom is a large, quick air pressure increase followed by a large quick decrease. Then the pressure returns to normal. sound . A series of vibrations that you can hear What does the speed of sound measure? Speed of sound measures the rate at which sound waves travel. What is sound? Sound is a series of vibrations that you can hear. echo ech o Sound waves reflected from surfaces. The ______ of a sound describes how high or low a sound is. pitch Which form of matter do sound waves travel the fastest? Sound waves travel fastest through hard, solid materials. This is because the particles are close together and bump into each other often. Sound travels through liquid _______ than through air. Sound travels through liquid faster than through air. Moving areas of high and low pressure that carry sound are _______. sound waves The sound of a shock wave produced by an object moving faster than the speed of sound is a ________. sonic boom Vibrations that you hear are _________. sounds How fast sound moves is the _______. speed of sound A reflection of sound is an ________. echo The amount of sound energy reaching your ears is _______. loudness A ______ is the sound you hear when something is moving faster than the speed of sound. sonic boom You are more likely to hear an echo when standing ______. facing a tall, smooth wall What we hear as pitch is related mostly to _______. how fast the source of the solid is moving back and forth A ______ is a place where particles are squeezed closer together by a sound wave. compression Sound waves cannot travel through ________. empty space A sound wave has areas called ________ where particles are squeezed together. compressions You can make the sound louder if you pluck a guitar string by ______. moving the string farther before letting go A ______ reflects sound best. hard, smooth surface loudness loud ness A measure of the amount of sound energy reaching your ears. What are sound waves? Sound waves are quickly moving areas of high and low pressure. All sound is carried through sound waves. What is the outer ear? The outer ear is like a funnel. It collects sounds and guides them to the eardrum. The middle ear contains _____? The middle ear contains three tiny bones; the hammer, the anvil, and the stirrup. compression com pres sion The area where air is pushed together. What is the middle ear? The middle ear is made up of three tiny bones that connect the outer ear to ther inner ear. The three bones are called the hammer, the anvil, and the tirrup because of their shape. vibration vi bra tion A back-and-forth movement. How many main parts does the human ear have? The human ear has three main parts: the outer ear, the middle ear, and the inner ear. Which part of the ear connects it to the outside world? The outer ear connects the ear to the outside world. In what direction do sound waves travel? Sound waves move out in all directions from a vibrating object. What is the inner ear? The inner ear is a snail-shaped tube filled with liquid. Tiny hairs on the inside are connected to nerves. Sounds move the hairs, which send signals along nerves to the brain. Your brain figures out the signal, and you hear sound. sound waves . Quickly moving areas of high and low pressure. What is the eardrum? The eardrum separates the outer ear from the middle ear. It is made of thin material that bends eaily. It is about 1 centimeter (1/2 inch) across. The eardrum vibrates when sound waves hit it. As the eardrum moves back and forth, it moves a tiny bone at the outside of the middle ear. Which part of the ear is connected to nerves that send signals to the brain? The inner ear is connected to nerves that send signals to the brain.