Wave Interactions

Two wave pulses move toward each other along a rope. Which diagram shows the resulting wave when they cross at point X?

2

Two pulses are moving along a string. One pulse is moving to the right and the second is moving to the left. Both pulses reach point P at the same instant. Which diagram shows the appearance of the string after the pulses pass point P?

3

Consider this image of a wave. Which wave would cause destructive interference at every point of the wavelength and completely cancel out the wave?

4

The two waves in the diagram are occupying the same place at the same time. At what time will the interfering waves have an amplitude of zero?

4

Which is the best example of the wave phenomenon called transmission?

A street is seen through a window.

Two wave pulses move toward each other along a rope. Which diagram shows the resulting wave when they cross at point X?

B ______^______

Study the image below. What interaction causes the water to spread as they pass through the rock opening?

Diffraction

Charina says that when waves interact with an object, they will interfere with the object, and when waves interact with other waves, they will reflect off each other. Do you agree with her? Why or why not?

I disagree with her, because interference happens when waves interact with other waves. Reflection happens when waves interact with an object and bounce off of it.

What is the purpose of a rearview mirror in a car?

The mirror allows the light to be reflected so the objects behind the car can be seen.

When musicians tune their instruments, they listen for "beats" in the sound the instruments produce when matched to a standard pitch. These beats are moments when the sound becomes louder, then softer, then louder again. Musicians adjust the pitch of their instruments until they do not hear any more beats in the tuning process. Which statements explain the phenomenon described in the scenario? Check all that apply.

The moments of loudness represent constructive interference. The moments of softness represent destructive interference. The instrument is tuned when the frequencies of the standard and the instrument align.

Rohit is trying to tune an instrument. He strikes a tuning fork and then plays a note that almost matches it. Rohit hears the volume of the two waves beating, which sounds like "wah-wah-wah-wah." What is the cause of the beats? The two waves produced have different speeds. The two waves produced have different amplitudes. The two waves produced have different wavelengths. The two waves produced have different frequencies.

The two waves produced have different frequencies.

Which picture best demonstrates the phenomenon of diffraction?

a disks w rainbows

If the energy of the wave becomes part of the internal energy of the object, then the wave's energy is

absorbed

What phenomenon allows the sidewalk to heat up and cook an egg?

absorption

Which part of the wave is changed when there is interference?

amplitude

Which ray diagram demonstrates the phenomenon of absorption?

b arrow points into line with squiggles on under it

Which ray diagram demonstrates the phenomenon of refraction?

b arrow points to line with arrow pointing under it

When two waves are in sync with each other and occupy the same place at the same time, how is the resulting wave determined?

by adding the amplitude of the two waves

If a soundproof door is almost shut but still leaves a small opening, what wave phenomenon is responsible for someone being able to hear sound from the room while standing by the wall to the side of the opening?

diffraction

If a soundproof door is almost shut but still leaves a small opening, what wave phenomenon is responsible for someone being able to hear sound from the room while standing by the wall to the side of the opening? absorption diffraction reflection refraction

diffraction

Study the image below. What interaction causes the water to spread as they pass through the rock opening?

diffraction

The image shows water passing through a barrier. What type of wave activity is shown in the image?

diffraction

Sunlight is shown filtering through clouds. What wave phenomenon is responsible for the sunlight shown in this diagram? diffraction, because light is bent around the clouds refraction, because the light bends through the clouds absorption, because the sunlight is absorbed by the clouds transmission, because the sunlight travels through the clouds

diffraction, because light is bent around the clouds

In 1940, the Tacoma Narrows Bridge across the Puget Sound collapsed. The bridge was a suspension bridge. The wind blowing through the narrows matched the natural frequency of the bridge. This resulted in a large movement of roadway, which eventually caused the bridge to fail. What characteristic of waves caused the bridge to collapse?

interference, because constructive interference occurred when the wind frequency matched the natural frequency of the bridge

In 1940, the Tacoma Narrows Bridge across the Puget Sound collapsed. The bridge was a suspension bridge. The wind blowing through the narrows matched the natural frequency of the bridge. This resulted in a large movement of roadway, which eventually caused the bridge to fail. What characteristic of waves caused the bridge to collapse? absorption, because the bridge absorbed all the energy of the wind diffraction, because the wind moved around the bridge, which set the bridge into motion interference, because constructive interference occurred when the wind frequency matched the natural frequency of the bridge interference, because destructive interference occurred when the wind frequency matched the natural frequency of the bridge

interference, because constructive interference occurred when the wind frequency matched the natural frequency of the bridge

What best describes the refraction of light rays?

light bending when it passes through a lens

What best describes the refraction of light rays? light bouncing off of a mirror light bending when it passes through a lens light getting brighter when two waves combine light passing through a clear glass window

light bending when it passes through a lens

constructive interference

occurs when two or more interfering waves combine to produce a wave with a larger displacement in the same direction. resulting wave has greater amplitude and more energy

destructive interference

occurs when two or more interfering waves combine to produce a wave with a smaller displacement in the opposite direction. resulting wave has lower amplitude and less energy

Bats use a process called echolocation to find their food. This involves giving out sound waves that hit possible prey or food. When the waves hit an object, they bounce back to the bat, allowing the bat to locate its prey. What type of wave interaction is echolocation?

reflection

When a DVD is played, a laser light hits the surface of the disk and then returns to the detector. Which wave phenomenon allows the DVD player to work?

reflection

Study the image below. The straw appears to "bend" because of

refraction

diffraction

the bending and scattering of a wave as it hits an object or goes through an opening changes the direction of the wave and spreads out the enery

refraction

the bending of a wave as it passes through one medium to another medium this can speed up or slow down the wave depending on the properties of the medium

reflecion

the bouncing of a wave after it hits an object energy is absorbed on one side and reemited on the same side

transmission

the passing of a wave through an object energy is absorbed on one side of an object and then reemitted on the other side

interference

the phenomenon that occurs when two waves meet while traveling along the same medium when waves meet they can build on each other or break each other down

absorption

the taking in of a wave by an object as the wave hits the object energy from wave increases internal energy of object

Recall the examples of transmission and absorption, then determine which ones are similar here. People are able to hear footsteps because the sound made by a foot hitting the floor travels through the air to reach their ears. When light from the sun hits the sidewalk, the sidewalk becomes warmer. Drivers are able to see objects ahead of them because light travels through windshields Cooking in a microwave oven is possible because of ____

transmission absorption transmission absorption