WAVES introduction

                 CHAPTER 15

WAVES

INTRODUCTION

In day to day life we are familiar with different types of waves. All types waves transfer energy from one point to another without the bodily sovement of the particles of the medium. Generally there are three types of was. The most familiar type of waves are the mechanical waves. eg. waves sa streched string, water waves, sound waves, seismic waves etc. All these require a medium for propagation. Another type of waves are the electromagnetic waves. They do not require a medium to travel. eg. light, radio waves, x-rays, γ -rays etc. All these waves travels with the velocity of light. A third kind of wave is the matter waves. They are associated with matter. The matter waves can easily be detected in the case of very small particles like electrons, protons, neutrons, atoms and molecules etc. They arise in quantum mechanical description of matter. Matter waves associated with electrons are employed in the making of electron microscope. In this chapter we will study mechanical waves only.

WAVE MOTION

Wave motion is one mode of transfer of energy from one point to another. For the propagation of a mechanical wave an elastic continuous medium is required.
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