![]() Explain what phenomena you would expect to observe. ĭefine, providing an example: Ī wave is heading towards an object it rebounds off it and bends around it. total internal reflection principle of refraction interference scattering. The shorter the wavelength of the light the greater amount of refraction – this is why you can usually hear higher noises if someone leaves there window open and you are behind the car.Ĭompare and contrast constructive and deconstruction interference. Diffraction Interference Scattering Polarization. When you heard the sound in the opposite room, you were not in direct line of sight, rather the sound had to bend around an obstacle to reach you. It occurs when a mechanical wave bends around a medium. Have you ever been sitting in another room and heard people speaking? This every day phenomena is known as refraction. This can be defined by snell’s law and we will go into more depth later on. The when leaving the high density plastic and returning to low density air it bends back. For example the light bends to the left when it goes from low density air to high density plastic in the below picture. This causes the wave to change direction slightly veering one way when it changes mediums of varying density. Refraction occurs when a wave changes mediums. This can also be seen in the skipping rope when you create a pulse, it will rebound off the other side and return back to you. If you go to a large area and yell, the sound will bounce off the neighboring mountains and you will here your voice. When the waves add together it is known as constructive interference and where they cancel one another it is known as deconstructive interference. The regions where the pulse is a peak and a peak will add together and the peaks and troughs will cancel one another out. ![]() This phenomena of interference is known as superposition. The waves will then continue along the rope. When two waves move through the same medium and overlap, they interfere with one another, this can be seen in a skipping rope if people make a pulse which travels along it, the area of overlap will result in interference. Mechanical waves are the net movement of energy, not the medium itself – it is important to remember this. ![]() the interference that occurs when waves combine to make a wave with a larger amplitude. the bending of waves as they move around a barrier or pass through an opening. Explain the behaviour of waves in a variety of situations by investigating the phenomena of: the bending of waves as they enter a new medium at an angle. In practice it looks like this: To calculate the fringe spacing we use the following relationship: w Fringe spacing (m) Wavelength (m) s distance between the slits (m) D Distance between the slits and the screen (m) Notice that for white light the colours are splits, but there is a central part which remains white.
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