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KS3 Science
Waves 2
Home learning
Name : _____________________________________
Class : ___________________________________
Teacher: ___________________________
Practical Skills:
and decide
variables
- Draw conclusions
- Create models
This topic has links to:
Maths in science:
- Standard form
- Converting units 1
Keywords :
- Longitudinal
- Transverse
- Amplitude
- Wavelength
- Frequency
- Ultrasound
- Ultraviolet
- Reflection
- Refraction
- Microphone BBC Bitesize → shorturl.at/cwAGY
Task 1: Introduction to sound In and on: Solve this cryptogram
- What causes sound when a drum is hit?
- What type of wave is sound? Draw a diagram to show this type of wave below.
How are sounds made
- Sounds are caused by vibrations.
- The vibrations are passed on to air particles.
- The air particles bump into each other and the wave progresses.
- Eventually the vibration is transferred to your ears and you hear a sound. What does volume mean?
- Volume is how loud or quiet something is.
- More energy in a vibration = a louder noise
- The loudness of a sound is measured in decibels (dB).
- The greater the amplitude (size) of the vibrations the greater the volume.
Label the diagram of the ear using the video to help
- What is the unit for loudness?
- Label amplitude and wavelength onto the wave below:
- Draw a wave that would have a higher pitch than the wave above:
- What piece of equipment do we use to display a wave?
Web address → shorturl.at/gjuKS
Explain how the ear converts sound waves into electrical signals
Ear damage Make a mind map on the causes of poor hearing and possible solutions. Ear damage
Web address → shorturl.at/finQV
Extra notes
(c) (i) Sally works for five hours in a nightclub. What should the maximum sound level be in the nightclub so that her hearing is not damaged? Use the graph to find your answer. ………… dB 1 mark (ii) How can ear plugs protect Sally’s ears? ……………………………………….………………………………………. ……………………………………….………………………………………. 1 mark Maximum 4 marks Mark out of 4:
Task 2: Exploring sound
In and On: Why can no-one hear you scream in space? Sound is a series of _ _ _ _ _ _ _ _ _ _ in the medium – one set of _ _ _ _ _ _ _ _ _ bumping into the next, carry the vibrations through. The _ _ _ _ _ _ the material, the _ _ _ _ _ _ _ the sound travels through. Complete the box below 18,000Hz 16,000Hz 14,000Hz 12,000Hz 10,000Hz 8,000Hz 6,000Hz 4,000Hz 2,000Hz 1,000Hz 500Hz Write the trend you notice as you go down the frequencies. As you go down the frequencies _________________
What frequency can you no longer hear above? What frequency can you no longer hear below? Ultra sound - This is sound frequencies above what humans can hear, what animals can you think of that use this? Infra sound - This is sound frequencies below what humans can hear, what animals can you think of that use this?
Listen the frequencies generated by the website: Chand the frequency using thos in the box below to answer the questions http://onlinetonegenerator.com/
**Additional Notes
_________________________________________________________**
**Extra Notes
__________________________________________________________**
Uses of
Ultrasound
Microphone A microphone transfers energy from pressure waves into an electrical signal. As sound waves arrive, the ______________ make a coil of wire vibrate. The coil is next to a ___________, so this produces a flow of ___________. Vibrations, magnet, current Loudspeaker Once the electrical signal has been generated, we need to turn it back into pressure waves. This is done using a loudspeaker. Earphones can be used instead, these are essentially tiny loudspeakers. The electrical signal is fed into a coil of wire, which sits in a __________________. As the signal changes, the coil _____________. The coil is attached to a ___________ and this vibrates too. The vibrating cone makes the air vibrate. Magnetic field, vibrates, cone Making audio recordings Sounds vary according to how loud they are and also how high they are. If the sound is converted to an electrical signal, this has to be able to capture this information too. This is possible because the electrical signal isn’t a steady flow of current, such as from a battery, but keeps changing both in size and direction. Louder sound – Higher sound –
How we see Light travels from the source in a ___________ line as rays, it is ___________ off an object. The yellow bus will absorb all colours of light apart from __________. The yellow light will reflect off the bus and travel to the ______ and be detected. Complete the diagram below to show reflection with labels:
Use the diagrams below to explain why you can see yourself in a mirror but not in a piece of paper:
Mirror (^) Paper
Task 5 – Exploring Light
In and On: How is a rainbow created? . Which colour has the longest wavelength? Which colour has the shortest wavelength? If you combine all the colours together, what do you get? Additional notes
Web address → shorturl.at/krCNT
Coloured light White light is a mixture of different colours. We can separate the light using a triangular prism. We can also mix coloured light together to produce other colours. What are the primary colours of light? What colour is produced when blue and green light is mixed? Extra notes
