Chapters 17-18 Test Study Guide Flashcards
A mechanical Wave moves through a medium which could be a _____,____,____
- Solid 2. Liquid 3. Gas
A disturbance sends ripples across water in a tub. These ripples are an example of a type of wave?
Surface wave
When a surfer rides an ocean wave on her surfboard. she is actually riding on what part of the wave?
A crest that is toppling over
To determine the speed of a wave, what formula?
Speed=(Wave Length)(Frequency)
A wave length of 15mm and a frequency of 4 Hertz. What is the speed?
60 m/s
How do you find the amplitude of a wave?
Use trough to rest position or crest to rest position
When a wave strikes a solid barrier, it behaves like a basketball hitting a backboard. This behavior is called what?
Reflection
Suppose two waves collide and the temporary combined wave that results is smaller than the original waves. What term best describes this interaction?
Destructive inference
A sound wave is an example of a what type of wave?
Longitudinal
A piano, violin, or guitar uses the resonance of a wooden soundboard to do what?
Amplify the sound
A ambulance siren… What scientific term would you use to explain how this happens?
The doppler effect
When a sound source approaches you, what happens to the pitch of the sound?
it becomes higher than when stationary
Which part of the ear amplifies the vibrations from sound waves?
Middle Ear
The part of the ear that sends coded nerve signals to the brain is what?
The inner ear
To calculate the frequency of an electromagnetic wave, you need to know the speed of the wave and its ___?
Wavelength
Light acts like what?
Wave and particle
Photons travel outward from a light source in which direction?
All directions
How do Polarized glasses work?
Blocking waves that vibrate in one plane
When droplets of water in the atmosphere act like prisms, the colors in sunlight undergo what?
Dispersion
What an object is made of and the color of light that strikes it determines what?
Color of an object
What are the primary colors of light?
Red… Blue.. Green
What are the primary colors of pigments?
Magenta.. Cyan…. Yellow (Same as secondary colors of light… Combines to black)
Many streets and parking lots are illuminated with what type of light?
Sodium Vapor Lights
Instead of crests and troughs, as in an ocean wave, a longitudinal wave has compressions and _______.
Rarefactions
A pebble drops down into a tub of water, setting off _____ Waves that travel between the water and air.
Surface
In a transverse wave, _____ is measured from crest to crest or from trough to trough
Wavelength
TO determined the speed of a wave, you must know the waves wave length and ____.
Frequency
If a wave length of 2 m and a frequency of 3 hertz, its speed is _____
2 M/S
To compare the energy of different waves, measure the _______ of the waves.
Amplitude
Amplitude measures the greatest displacement of a wave from the ______.
Rest position
If two waves collide and form a temp. larger wave, the interference is ____.
Constructive
The standard measure used to compare sounds intensities is the ___.
Decibel
When I train streaks by blowing it’s whistle, the changing picture here is due to the ______.
Doppler Effect
The further away you are from a light source the____ intense it is
Less
Electromagnetic waves can travel through a
Vaccuum
Visible light waves have a shorter _____ then infared waves have
Wave length
What unit is way frequency measured?
Hertz
Supposed to waves meet and temporarily cancel each other out. How would you describe the inference?
Destructive
What is the Doppler Effect?
Sound approaches higher frequency, sound moves away lower frequency
Use the scattering of light to explain why the sun is red at sunset
Blue light scattered by small particles leaving red and orange
What type of light passes through a polarizing filter?
White that vibrates in one plane
What two factors influence the color of an object?
The color of light striking
Both wave A and wave B were started by the same type of force and up-and-down motion. What conclusion can you make about the energy of these two wave starting forces?
Force causeway A to have more energy
Explain why the pencil appears to be broken
Light moves as it goes through one medium to another so it appears broken
Figure represents white light striking an object. Explain why the beam of light is also labeled with colors
White light is made up of all the frequencies that produce colored light
Was a wave movement during one second. What is the frequency of this wave?
2 hertz
To what is amplitude related
Related to the amount of energy carried by a wave to maximum displacement from rest position
