Year 7 - Science
Travelling sound
Sound, light and vision
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores sound and light waves, including frequencies, echoes, reflection, absorption, and the need for a medium for sound to travel. It also compares light and matter waves, investigates light transmission and colour, and examines wave properties and effects.
Lesson Summary
You will learn to explain why sounds are quieter at a greater distance, and why sound waves travel faster in solids and liquids than gases but not at all through a vacuum.
Key Notes
- Sound spreads out and becomes quieter (lower amplitude vibrations) as it travels.
- Sound travels through a medium by vibrations being passed on between the particles of the medium.
- Sound travels faster through liquids than gases as the particles are closer so vibrations can be passed on more easily.
- Sound travels fastest through solids due to strong attractive forces between particles so many vibrate when one does.
- Sound waves are caused by vibrations of particles so sound can't travel through a vacuum (where there are no particles).
Vocabulary To Learn
- particles: What solids, liquids and gases are made up from.
- vibrate: To regularly and repeatedly move back and forth.
- sound wave: A 'pulse' that travels through a material caused by the vibrations of particles.
- medium: The material that sound is travelling through, that is set vibrating.
- vacuum: An area of space with no matter present (that contains no particles).
Common Mistakes To Avoid
- Sound needs gaps through which it moves in order to enter a room or space. At the same time, most pupils can state that sound can't travel in a vacuum but the majority cannot correctly explain why.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Sound spreads out and becomes quieter (lower amplitude vibrations) as it travels. Sound travels through a medium by vibrations being passed on between the particles of the medium.
2. Define this scientific word and use it in context. 'particles'
What solids, liquids and gases are made up from. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Sound needs gaps through which it moves in order to enter a room or space. At the same time, most pupils can state that sound can't travel in a vacuum but the majority cannot correctly explain why. Correction: An alarm can still be heard in a sealed container that has no gaps (e.g. kilner jar). Provide lots of experiences and examples of sound travelling through gases, liquids and solids and struggling to travel through a partial vacuum.
More Lessons In This Unit
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