Science lesson plan · 6th grade (Year 7 in England) · 60 minutes
Frequency and amplitude of sound waves
Light, sound and waves
CCSS NGSS.MS-PS4-1England: KS3 Physics: Waves (sound)
Objective and success criteria
Students will: Frequency and amplitude of sound waves.
- I can answer questions on today's skill on my own, without help.
- I can explain each step and say why it works.
- I can check my answer and spot a mistake.
Before and after
Needs first: Pitch and loudness; Parts of a wave
Leads to: the next skill in this area.
Materials: Slinky or rope, Mirrors and torches, Mini whiteboards, A diagram or short video clip of the idea, Printed student sheet (below).
Warm-up · 6 min
- Quick retrieval from earlier learning (Pitch and loudness; Parts of a wave). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
- Which drum makes the lowest sound? (a tiny drum / a small drum with a tight skin / a drum with a very tight skin / a big drum with a loose skin) → a big drum with a loose skinPrompt: Big, loose skins vibrate slowly.
- Pitch and loudness: which statement is true? (Sounds get quieter the further you are from the source. / Hitting a drum harder makes a higher note. / Longer strings make higher notes. / Loud sounds always have a high pitch.) → Sounds get quieter the further you are from the source.Prompt: Pitch is about how fast; loudness is about how big.
- How do you make a drum sound louder? (use a smaller drum / cover it with a cloth / hit it harder / hit it more gently) → hit it harderPrompt: Bigger vibrations make louder sounds.
Hook · 6 min
- Ask the class to make a wave with a rope or slinky and describe what moves and what doesn't.
- Share the objective: Frequency and amplitude of sound waves. Read the success criteria together.
I do: model it · 12 min
- Work through the example out loud, saying why you do each step, not just what you do.
- Example: A guitar string vibrates 400 times in 4 seconds. What is the frequency of the sound, in hertz (Hz)?
- Step 1: 400 ÷ 4 = 100
- Step 2: So the answer is: 100 Hz
- Answer: 100 Hz
- Pause after each step and ask a student to say what comes next.
We do: guided practice · 12 min
- Do these together. Students try each step on whiteboards before you reveal it.
- Use the hints as prompts rather than giving the answer.
- A guitar string vibrates 220 times in 0.5 seconds. What is the frequency of the sound, in hertz (Hz)? → 440 HzPrompt: Frequency is the number of waves (vibrations) per second.
- Humans can hear from about 20 Hz to 20 000 Hz. Could a young person hear a sound of 15 kHz? (yes / no, it is ultrasound) → yesPrompt: Convert kHz to Hz first.
You do: independent practice · 17 min
- Students work on the student sheet. Circulate and check the first two answers of every student early.
- Students who finish: write a question of their own for a partner, with the answer.
The 8 questions are on the student sheet below, with answers in the key.
Exit ticket · 7 min
- Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
- A guitar string vibrates 5000 times in 5 seconds. What is the frequency of the sound, in hertz (Hz)? → 1000 HzPrompt: Frequency is the number of waves (vibrations) per second.
- Humans can hear from about 20 Hz to 20 000 Hz. Could a young person hear a sound of 50 kHz? (yes / no, it is ultrasound) → no, it is ultrasoundPrompt: Convert kHz to Hz first.
Watch out for
- Everyday meanings of words getting in the way of the science meaning: define key words explicitly.
- Remembering facts without the reason: ask "why?" and "what is the evidence?"
Support and stretch
Support
- Review first: Pitch and loudness.
- Use concrete materials: slinky or rope.
- Give the first step of each question, or a partly worked example to finish.
- Pair with a confident partner for the guided practice.
Stretch
- Explain a common mistake in writing and how to fix it.
- Write a word problem that uses today's skill, then solve a partner's.
Homework and more practice
Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-6.
Free lesson plan from eurekami.com/lesson-plan-builder