IQ3) How are Sound Waves produced and Detected?
1.5) What are Sound Waves and how do they travel?
WINKS
3) Explain, using the particle model, the transmission of sound in different mediums. a) classify a sound wave as a longitudinal wave b) link volume and pitch to the amplitude and frequency of a sound wave c) using the particle model, explain why sound doesn’t travel through a vacuum and travels fastest through a solid d) identify and label the main parts of the ear: outer ear, eardrum, ossicles, cochlea, auditory nerve e) describe how energy is transferred/transformed in the ear |
Practical : What are Sound Waves?
Most of us hear things all the time – the click of the keys on the keyboard, the notes to our favourite songs, cracks of thunder that accompany a storm…but what are sound waves and how does sound travel? Read through the powerpoint "Sound Waves" and make notes. |
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This is what a tuning fork in water looks like in ultra slow motion, filmed with the Phantom V2512 Ultra High Speed HD Colour Camera.
MUSIC SCORE: Artist "Jason Donnelly" |
Theory on Sound Waves
1) TRY THIS…….. a) Hum with your mouth and nose open b) Hum with your mouth open and nose closed c) Hum with your mouth closed and nose open d) Now can you - Hum with both your mouth closed and nose closed Sound needs particles to vibrate and transfer the energy. Hence sound cannot travel through space as there are almost no particles. 2) Read 4.2.3) Sound to the Investigation 4.3) pages 140 - 142 in your Core Science 5 textbook and summarise the information. You should have the diagram of a vibrating drum on pg 141 in your notes as it is very helpful to visualise a sound wave. Chapter 4 of Core science 5 3) Watch the video "Science - Transmission of Sound" and add to your notes where needed 4) Answer this question - Use the particle model to explain why sound doesn't travel through a vacuum (2 marks - 4 lines). |
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Additional Resources if you are interested
2) What happens when you place a loudspeaker in a Bell Jar??
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1.6) The Speed of Sound in Solids, Liquids and Gases
Question 1): Use the particle model to explain why sound travels fastest through a solid and slowest through a gas (4 marks - 8 lines)
Some resources to help you answer the question
a) Sensational Sound b) The Speed of Sound on pg 144 of Core Science 5 textbook |
1.7) How are sounds detected by the ear?
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Many of us take for granted a very extraordinary organ... our ears. To understand the ear, we need to understand what sound is and how the ear is structured.
Watch this video and write down a series of steps that explain how our ears detect sound. Make sure that at each step you correctly identify the part of the ear. Step 1 is done for you Step 1) The pinna channels the sound waves into the ear canal. |
Some neat images of the ear
Complete these interesting questions on the ear
1) For each part of the ear, write a description/function
2) Describe how energy transferred/transformed in the ear. 3) Why do we have two ears? 4) Why do our ears sometime pop? 5) Why do our ears sometimes ring? 6) How do we know if sound is coming from in front or behind us? 7) Explain why an ear infection may upset your sense of balance. |
Extension Activity - Applications of Sound Waves
Two very important applications of sound waves are sonar and ultrasound
a) Sonar is simply making use of an echo. When an animal or machine makes a noise, it sends sound waves into the environment around it. Those waves bounce off nearby objects, and some of them reflect back to the object that made the noise. It's those reflected sound waves that you hear when your voice echoes back to you from a canyon. Whales and specialised machines can use reflected waves to locate distant objects and sense their shape and movement. b) Ultrasound is a non-invasive technique used to capture internal images of the body, including blood vessels, muscles, organs and other soft tissues. Ultrasounds may be performed to monitor the progress of a growing foetus inside a mother’s uterus, to detect abnormalities or signs of disease or even to visually assist with surgeries and biopsies. Choose one of these applications, research and write 1 - 2 paragraphs on how sound waves are used in these applications. Include at least 2 diagrams. Hand in to Mrs Pizzimenti to be read and commented on. |
Experiment) Make A Pendulum Wave
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Additional Resources
1) The Coolest Things Sound Waves Do - Sound waves are all around us, and when harnessed, can do some super cool things. Trace looks at a few ways we're using the power of sound waves to our advantage.
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2) Sound Uncovered
For this practical activity, you are going to need the following two apps, "Sound Uncovered" and "Soundbeam". Download the file "2.7) Practical Activity on Sound Uncovered" and explore sound. |
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4) Amazing Cochlear Implants
Cochlear implants are the only medical technology able to functionally restore one of the five senses. Unlike hearing aids, which amplify sound, cochlear implants are electronic devices that bypass the damaged part of your inner ear so that you can hear your best. More reading at the Powerhouse Museum |