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🔬 Science - Class 9
Unit 10 · Wave

Mechanical Waves and Electromagnetic Waves Presentation

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Science and Technology, Class 9 · Unit 10

Mechanical and Electromagnetic Waves

Waves with and without a medium · The electromagnetic spectrum

Meet the mechanical wave

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Energy moves through vibration in matter

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Needs a medium to travel

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Energy is used up in the medium

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Reaches only a limited distance

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Presenter notes: Start by ringing a bell or clapping. How did that sound reach us? And how did the sunlight at the window reach us? Today these two questions lead us to the two families of waves.