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Waves (dangers (ultraviolet light, gamma rays (damage cells and disrupt…
Waves
dangers
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gamma rays
damage cells and disrupt DNA, may lead to cancer
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ultrasound
uses
fishing boats - use sonar and echo location to find shoals of fish or map the floor of the ocean ( oceanography )
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sound with frequency higher than 20,000Hz
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radar
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used by air traffic controllers to detect passenger aircrafts by the military to track missiles and by the coast guard to detect ships
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vibrations (oscillations) which transfer energy from one point to another, without the movement of any matter