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Science lesson plan · 7th grade (Year 8 in England) · 45 minutes

Speed of sound and echoes

Light, sound and waves

CCSS NGSS.MS-PS4-1England: KS3 Physics: Waves (sound waves)

Objective and success criteria

Students will: Speed of sound and echoes.

  • 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: Sound comes from vibrations; Speed = distance ÷ time

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 · 5 min

  • Quick retrieval from earlier learning (Sound comes from vibrations; Speed = distance ÷ time). Students answer on mini whiteboards.
  • Show answers together and note who needs support in the main task.
  1. What makes the sound when you pluck a guitar string? (the string vibrating / light from the string / the string getting hot / the wood breathing) → the string vibratingPrompt: Touch the string gently after plucking it.
  2. A dog travels 50 m in 5 s. What is the average speed, in m/s? → 10 m/sPrompt: speed = distance ÷ time
  3. Sound: which statement is true? (Sounds get fainter as you move further from the source. / Sound cannot travel through water. / Sound travels through space between planets. / Loud sounds do not involve vibrations.) → Sounds get fainter as you move further from the source.Prompt: Can sound travel where there is nothing at all?

Hook · 5 min

  • Ask the class to make a wave with a rope or slinky and describe what moves and what doesn't.
  • Share the objective: Speed of sound and echoes. Read the success criteria together.

I do: model it · 10 min

  • Work through the example out loud, saying why you do each step, not just what you do.
  • Example: You see lightning and hear the thunder 2 seconds later. Sound travels at about 340 m/s. About how far away is the storm, in metres?
  • Step 1: 340 × 2 = 680
  • Step 2: So the answer is: 680 m
  • Answer: 680 m
  • Pause after each step and ask a student to say what comes next.

We do: guided practice · 10 min

  • Do these together. Students try each step on whiteboards before you reveal it.
  • Use the hints as prompts rather than giving the answer.
  1. You see lightning and hear the thunder 4 seconds later. Sound travels at about 340 m/s. About how far away is the storm, in metres? → 1360 mPrompt: Light arrives almost instantly; the delay is the sound travelling.
  2. You shout towards a cliff and hear the echo 1.5 s later. Sound travels at 340 m/s. How far away is the cliff, in metres? → 255 mPrompt: The sound goes to the cliff and back.

You do: independent practice · 10 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 · 5 min

  • Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
  1. You shout towards a cliff and hear the echo 3 s later. Sound travels at 340 m/s. How far away is the cliff, in metres? → 510 mPrompt: The sound goes to the cliff and back.
  2. You see lightning and hear the thunder 4 seconds later. Sound travels at about 340 m/s. About how far away is the storm, in metres? → 1360 mPrompt: Light arrives almost instantly; the delay is the sound travelling.

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: Sound comes from vibrations.
  • 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-7.

Free lesson plan from eurekami.com/lesson-plan-builder

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Speed of sound and echoes

Name

Date

Score/ 8

  1. Question 1

    You shout towards a cliff and hear the echo 1.5 s later. Sound travels at 340 m/s. How far away is the cliff, in metres?

    Answerm

  2. Question 2

    You see lightning and hear the thunder 2 seconds later. Sound travels at about 340 m/s. About how far away is the storm, in metres?

    Answerm

  3. Question 3

    What is ultrasound?

    • A. sound with a frequency too high for humans to hear
    • B. light we cannot see
    • C. very loud sound
    • D. sound that travels in a vacuum

  4. Question 4

    You shout towards a cliff and hear the echo 2 s later. Sound travels at 340 m/s. How far away is the cliff, in metres?

    Answerm

  5. Question 5

    You see lightning and hear the thunder 5 seconds later. Sound travels at about 340 m/s. About how far away is the storm, in metres?

    Answerm

  6. Question 6

    Why do you see lightning before you hear thunder?

    • A. Your eyes are faster than your ears
    • B. Light travels much faster than sound
    • C. Sound travels faster than light
    • D. Thunder is made later

  7. Question 7

    In which material does sound travel fastest?

    • A. air
    • B. steel
    • C. water
    • D. a vacuum

  8. Question 8

    You shout towards a cliff and hear the echo 0.5 s later. Sound travels at 340 m/s. How far away is the cliff, in metres?

    Answerm

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Answer key: Speed of sound and echoes

  1. 1. 255 m

  2. 2. 680 m

  3. 3. A. sound with a frequency too high for humans to hear

  4. 4. 340 m

  5. 5. 1700 m

  6. 6. B. Light travels much faster than sound

  7. 7. B. steel

  8. 8. 85 m