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Sound as a wave
Explain sound as a longitudinal wave, link pitch to frequency and loudness to amplitude, and calculate distances from echoes.
⏱ 18 min❓ 9 questions
What you'll be able to do
- ✔I can explain why sound is a longitudinal mechanical wave that needs a medium
- ✔I can relate pitch to frequency and loudness to amplitude, including the decibel scale
- ✔I can use speed = distance ÷ time to solve echo and sonar problems
How this works
- 1Read the short explanations first — they teach you what you need before each question.
- 2Answer each question, then tap Check. A right answer moves you on automatically; if it's wrong, you'll see a friendly explanation of why.
- 3Finish all 3 steps to see your score — sign in and subscribe to unlock the full lesson and save it.
What's inside
9 questions and 1 quick teaching card, including:
- 🔢Number answer — Work out the answer and type the number.
👪Grown-up tip: sit alongside younger learners for the first few lessons. Read the questions together and chat about the explanations — that's where the real learning sticks.
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Curriculum: AC9S9U04