How does reflection change a

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Presentation transcript:

How does reflection change a 17.3 Key Concepts How does reflection change a wave? What causes the refraction of a wave when it enters a new medium? What factors affect the amount of diffraction of a What are two types of interference? What wavelengths will produce a standing wave?

The ripples visible on the bottom of the pool are caused by light shining through ____________ waves. surface

Ex: When waves bounce of the side of a pool ________ Reflection Reflection occurs when a wave ____________ off a surface that it cannot pass through. Ex: When waves bounce of the side of a pool ________ bounces wall Reflection does not change the speed or frequency of a wave, but the wave can be flipped ______________. upside down

Refraction Refraction is the _____________ of a wave as it enters a _____ _____________ at an ____________. bending new medium angle When a wave enters a medium at an angle, refraction occurs because ____________ of the wave moves more ______________ than the other side. one side slowly

Refraction Grass Gravel Ex: Think of a lawnmower when it is pushed at an angle from the grass onto the gravel. The wheel on the _____________ slows down, but the other wheel is still moving at a faster speed on the grass. Left wheel is still rolling faster on grass. Direction changes. gravel Mower pivots because the right wheel moves more slowly when it reaches gravel.

An ocean wave bends or ____________ as it approaches the shoreline. Refraction An ocean wave bends or ____________ as it approaches the shoreline. The __________ water can be considered a new medium refracts shallow

Refraction The ________ side of the wave reaches the shallow water first and _______ down, causing the wave to bend If a wave front approaches a shoreline perfectly ______________, no refraction occurs left slows parallel

Diffraction Diffraction is the bending of a wave as it moves _____________ an obstacle or passes through a ________________ opening. around narrow A wave diffracts more if its wavelength is _______________ compared to the ________ of an opening or obstacle. large size

Diffraction also occurs when a wave encounters an __________________. This wave diffracts, or _______________, after it passes through a narrow opening. Diffraction also occurs when a wave encounters an __________________. spreads out obstacle

Interference Interference occurs when two or more waves ________________ and combine together. overlap Two types of interference are _______________ interference and _______________ interference. constructive destructive

Interference When waves collide, they can occupy the same region of space and then continue on. Constructive interference occurs when two or more waves combine to produce a wave with a _____________ displacement. Destructive interference occurs when two or more waves combine to produce a wave with a _________________ displacement. larger smaller

Constructive Interference Two waves with equal frequencies travel in opposite directions. When a _________ meets a ______________, the result is a wave with an increased amplitude. crest crest

Destructive Interference Two waves with equal frequencies travel in opposite directions. When a ___________ meets a ____________, the result is a wave with a reduced amplitude. crest trough

Standing Waves A standing wave is a wave that appears to stay in ________________— it does not seem to move through the medium. Ex: Think of plucking a guitar string one place A standing wave forms only if _________ a wavelength or a _______________ of half a wavelength fits exactly into the _____________ of a vibrating cord. half multiple length

incoming wave on a guitar string? And a reflected wave? Standing Waves Interference occurs as the _____________ waves pass through the ______________ waves. What would cause an incoming wave on a guitar string? And a reflected wave? incoming reflected plucking a string wave bouncing off ends

Standing Waves A ___________ is a point on a standing wave that has no displacement from the rest position. At the nodes, there is complete ______________ interference between the incoming and reflected waves. An ______________ is a point where a crest or trough occurs midway between two nodes. node destructive antinode

These photos show standing waves for two different frequencies. ________ wavelength equals the length of the cord. ________ wavelengths equal the length of the cord. One Two

Assessment Questions The property of waves bending as they pass through a narrow opening is called reflection. refraction. diffraction. destructive interference.

When does refraction of a wave occur? Assessment Questions When does refraction of a wave occur? The wave cannot enter the new medium. The wave enters a new medium at an angle. The wave enters a new medium at a parallel position. Part of the wave enters a new medium and part is reflected.

Assessment Questions A 6-meter rope is tied to a hook in the wall. Which of the following wavelengths can produce a standing wave? 1.5 m 2.5 m 3.5 m 4.5 m

Assessment Questions 4. The amount of diffraction of a wave increases as the size of the obstacle causing the diffraction decreases. True False