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How is sound produced? By vibrations.
What part of your body vibrates to let you speak? Vocal cords.
What is the term used to describe sounds as low or high? Pitch.
What happens to the sound of a bell when all gases are removed? There is no sound to be heard.
When there are no gas particles, what has been created? A vacuum.
Which animals can use sound to communicate under water? Dolphins and whales.
How does sound travel through a solid, liquid or gas? Particles collide and pass on sound vibrations.
Why does sound travel quickest through a solid? The particles are closer together.
Space is often described as a vacuum. Does sound travel quickly or slowly through space? Slowly.
The waves in high pitched sounds are c_______ t________. close together.
What is the amplitude? The height of a sound wave from the middle of the wave to the top. OR, the middle of a wave to the bottom.
Do loud sounds have a small or large amplitude? Large.
Close together waves mean a h______ f_______. high frequency.
The top of a wave is called a c______ and the bottom of a wave is the t_______. crest and trough
What is the frequency? The number of waves that pass a point in one second.
What are the units of frequency? Hertz.
What are the names of the small bones in the ear drum? Hammer, anvil and stirrup
The snail-shaped cochlea contains l_______. Liquid.
The liquid in the cochlea vibrates against h______ c_____. Hair cells.
What do the hair cells do? Send electrical signals along nerves to the brain.
What is the normal human hearing range in hertz? 20 Hz to 20,000 Hz.
Loudness in sound is measured in units call d______. Decibels.
Which two letters are used as the symbol of the Decibel? dB.
What are sound waves with a frequency above 20,000 Hz called? Ultrasound / ultrasonic sound waves.
What might ultrasound be used for in a hospital? Ultrasounds of babies in a mother's womb.
What might ultrasound be used for in a shipyard? Finding and checking defects in a ship's hull.
Which devices use ultrasound to map sea beds? Sonar.
True or false, ultrasound is used to clean jewellery. True.
True or false, ultrasonic toothbrushes can be used to remove plaque and clean teeth. True.
Name two ways in which a dolphin uses sound. 1) To communicate with other dolphins. 2) To herd fish shoals into locations for an attack. 3) To stun and even kill fish. 4) To "see" their surroundings using echolocation - like a radar.
Created by: DrLEC121