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IGCSE physics, mechanical wave which needs a medium to travel…

- - - - spectrum(low f to high f)
        
        Radio Waves–Communication(TV, radio)
        
        Microwaves–Cooking, satellite signals
        
        Infrared(IR)Waves–sean by Heat detection, remote controls
        
        Visible Light–Human vision, photography
        
        ultraviolet-kills bacteria
        
        1 more item...
        
        thermal energy
        
        coocking, can cause burns
- - - - speed of sound: faster in solids(air 343m/s, water 1,480 m/s, steel 5,120m/s)
        
        epends on the density and elasticity of the medium
        
        faster in hot air(molecules are moving quicker)
        
        v=f x λ, f=v/λ, λ=v/f
        
        2xdistance to wall/time to echo