Echoes and ultrasound - KS3 Activate lesson

A full 1 hour lesson designed for a mixed ability year 7 class.
This is the 5th and final lesson in “Chapter 2 - Sound” from Activate 1, Physics. This lesson is on ‘echoes and ultrasound’.
This lesson should be suitable to teach to any KS3 Physics class, even by those where physics is not their specialism.
This lesson (and all lessons in this unit) is designed to be interactive and engaging, with plenty of real world examples and independent tasks.

From this lesson, students should be able to:

1. Recall that an echo is reflected sound
2. Understand which materials reflect sound well and which materials absorb sound well
3. Describe how echoes can be used to calculate distance
4. Use simple, given examples of the time taken for an echo to be heard to calculate distance
5. Recall what ultrasound is
6. Recall two uses for ultrasound
7. Describe how sonar is used to calculate the depth of water

All of my lesson resources contain:

• A 5-in-5 retrieval-style starter
• An interesting lesson hook, careers link, or retrieval practice to start the lesson
• Teacher input slides with dual coding and reduced cognitive load
• Teacher models
• Regular ‘check for understanding’ slides, such as hand signals quizzes
• Regular student independent practice slides, with optional scaffolds, challenges and answer slides
• A plenary task