Did you know you've been cooking your food with light? Most of us have a microwave oven in our kitchens, and that's exactly what they do. When you press start, a device called a magnetron emits a ...

the speed of light and all electromagnetic waves in a vacuum is 300,000,000 m/s or 3×10 8 m/s the speed of sound in air is often taken to be 340 m/s.

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A boat at sea bobs up and down as waves pass. The vertical distance between a crest and a trough is 52 cm and 20 waves pass the boat in 30 seconds. 1. The amplitude of a wave is the maximum ...