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Key Stage 3 Science

How is sound produced? By objects vibrating. Answer must include the word “Vibration”.
What is the range of frequencies that humans can hear? 20 Hz – 20 000 Hz
What is an oscilloscope? A scientific instrument that shows images of waves on a screen / shows the trace of a wave.
Draw a wave with a very high amplitude. The waves should clearly be high. The number of waves DOES NOT MATTER.
What is the name for the three bones in the ear? Hammer, Anvil and Stirrup
What is the unit for frequency? Hertz (Hz)
What is the word used to describe how tall the wave is? Amplitude.
How does the frequency of a sound link to the pitch? The higher the frequency the higher the pitch, or vice versa.
What is a vacuum? An area where there is no particles / that is completely empty space.
What is the function of the eardrum? It detects sound waves by vibrating when a sound wave hits it.
What is the name of the part of a microphone that detects sound waves? ( metal) diaphragm
There are two tuning prongs: one is very short and one is very long. Which one will produce a higher pitched sound? The short one.
What two things do sound waves transfer? Energy and Motion (movement, vibration)
What is the amplitude of a wave? How loud it is / how tall the wave is.
Draw a wave with a low frequency. Should include only one or two waves in this space.
Is the frequency of a sound is very high, what does this tell you about the pitch? It is also very high.
What is the function of the ossicles? To amplify vibrations detected by the ear drum and pass them on to the cochlea.
What is the name for an area that contains no particles? Vacuum.
What is an echo? When sound waves are reflected back off of a surface and travel back to the source of the sound wave.
What is the order that sound travels through the ear? Eardrum, ear canal, ossicles, cochlea, auditory nerve.
Why do sound waves travel more easily in solids? Because the particles are close together so it is easier for the vibrations to be passed to neighbouring particles.
What is ultrasound? Waves that have a frequency above the human range of hearing / above 20 000 Hz.
Name two uses of sound waves. Any two from: cleaning objects, ultrasound scans, sonar, echolocation, healing / physiotherapy.
What is transmission? When a sound wave passes through a medium / through an object.
Define "amplitude" The maximum vibration, measured from the middle position of the wave
Define "frequency" Number of waves produced per second, in Hertz
Define "wavelength" Distance between two corresponding points on a wave. Measured in metres.
Define "vacuum" A space with no particles in it
Define "resting point" The mid-point of a wave vibration
Define "pitch" of a sound wave How high or low the sound is. A high pitch has a high frequency.
Define "volume" of a sound wave How loud or quiet a sound is. A high volume has a high amplitude.
State the unit of volume of a sound Decibels (dB)
State the speed of sound in air 330m/s
Name the six parts of the ear Ear drum, bones, cochlea, auditory nerve, semi-circular canals, pinner
Name the three bones in the middle ear Hammer, anvil, stirrup
State the function of the ear drum Thin layer of membrane that picks up the vibrations of sounds waves
State the function of the hammer, anvil and stirrup Amplify the vibrations
State the function of the cochlea Long coiled tube filled with liquid that picks up vibrations and changes them to electrical signals
State the function of the auditory nerve Carries signals from the ear to the brain
State the function of the semi-circular canals Detect movement in the head and help with balance
State the function of the pinner The outer ear; directs vibrations into the ear
Define "ultrasound" Sound waves with frequency higher than the auditory range
Define "auditory range" The range of frequencies that an animal can hear (for humans 20Hz to 20000Hz)
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