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AP_Physics_B_-_Diffraction

# AP_Physics_B_-_Diffraction - Diffraction AP Physics B...

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Diffraction AP Physics B

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Superposition . .AKA….Interference One of the characteristics of a WAVE is the ability to undergo INTERFERENCE . There are TWO types. We call these waves IN PHASE. We call these waves OUT OF PHASE.
Diffraction When light OR sound is produced by TWO sources a pattern results as a result of interference.

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Interference Patterns Diffraction is normally taken to refer to various phenomena which occur when a wave encounters an obstacle. It is described as the apparent bending of waves around small obstacles and the spreading out of waves past small openings
Diffraction – The Central Maximum Suppose you had TWO sources each being allowed to emit a wave through a small opening or slit. The distance between the slits denoted by, d . The distance from the slit spacing to the screen is denoted by the letter, L . If two waves go through the slit and then proceed straight ahead to the screen, they both cover the SAME DISTANCE and thus will have constructive interference. Their amplitudes will build and leave a very bright intense spot on the screen. We call this the CENTRAL MAXIMUM .

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Here is the pattern you will see. Notice in figure 2 that there are several bright spots and dark areas in between. The spot in the middle is the BRIGHTEST and thus the CENTRAL MAXIMUM. We call these spots FRINGES . Notice we have additional bright spots, yet the intensity is a bit less. We denote these additional bright spots as ORDERS. So the first bright spot on either side of the central maximum is called the FIRST ORDER BRIGHT FRINGE . Figure 1 represents the intensity of the orders as we move farther from the bright central maximum. Figure 1
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AP_Physics_B_-_Diffraction - Diffraction AP Physics B...

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