Energy and light

📖 Lesson ──▶ 🎯 Quiz — pick the translation ──▶ ✅ Lesson done

Energy is not created or destroyed — it only changes costume: chemical (fuel) → thermal → mechanical (engine). Light is an electromagnetic wave: color depends on wavelength, the rainbow splits white light into the spectrum. Light speed: 300,000 km/s — sunlight takes 8 minutes to reach us.

●Food energy: kilocalories — same physics as joules
●Redshift showed the universe expands
●LED saves ~90% energy vs the incandescent bulb

🌈 Fraunhofer of Munich split light into a spectrum 200 years ago — letting us learn what stars are made of without flying there.

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Test yourself!

Practice the topic with the trainer — like after class

Quiz — pick the translation → 🖨 Worksheet

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