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Electricity, Magnetism, Light & Sound

Grade 1 · Stretch challenge · 8 questions · Version PG-18EHNQB-1TU2

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1.Name a good electrical conductor.
2.What energy change occurs in a speaker?
3.What happens to pitch as frequency rises?
4.What can happen when light enters water?
5.Why does a shadow form?
6.How do you see an object?
7.What do like magnetic poles do?
8.Why can you hear an echo?

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 16
  1. Name a good electrical conductor.Copper
  2. What energy change occurs in a speaker?Electrical energy becomes sound
  3. What happens to pitch as frequency rises?Pitch becomes higher
  4. What can happen when light enters water?It refracts, or bends
  5. Why does a shadow form?An object blocks light
  6. How do you see an object?Reflected light enters your eyes
  7. What do like magnetic poles do?Repel
  8. Why can you hear an echo?Sound reflects from a surface

Worked example

Use a model to track energy, forces, and waves through a system.

Common mistake

Assuming energy travels without a path or medium.

Helpful hint

Draw the source, path, interaction, and result.