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Important Questions Based on Unit of Wavelength The submultiple units of wavelength are Decimetre (Dm), Millimetre (mm), Nanometre (nm), Centimetre (cm) and Micrometre (μm).
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Mechanical Waves: A medium is required for the propagation of mechanical waves.Sound energy needs a medium to travel whereas light energy can travel in a vacuum. Some types of energies don’t need a medium to travel so they travel in a vacuum. When energy travels in a given medium (solid, liquid, or gas) there can be certain disturbances in the flow, which results in waves. Wave is a conceptual representation of the transmission of energy in a vacuum or a medium.