Wave Parts and Types
Draw a Transverse wave and label the parts. How would this picture change if you increased the frequency?
Crest - Top of the wave
Through - Bottom of the Wave
Wavelength - Distance from the crest to crest or trough to trough
Amplitude - Height of the wave (Energy of the wave)
Describe what a wave does when it is transmitted?
Digital signals are written as ________ "waves"
Analog Signals are _________ waves
Draw both
Square (discrete values)
Sine (continuous waves)
Your friend screams at the top of their lungs and you jump. What type of a response would this be?
a. Memory response
b. immediate response
Immediate Response
Sound (a ______________ wave) travels _________ (slower/faster) than light (__________ waves)
Mechanical wave
Slower
Electromagnetic
Draw a picture of a longitudinal wave and label the parts.
Compression - The part of the wave where the molecules are closest together (most dense)
Rarefaction - The part of the wave where the molecules are farthest apart.
Wave Length - The distance from compression to compression or rarefaction to rarefaction.
If a sound wave can be heard through a wall but the sound is quieter then before, what wave actions could explain this?
The sound is being transmitted through the wall but some of that sound is either being absorbed and or reflected off the wall. Either of these will make the sound less loud (lower amplitude) on the other side of the wall.
Which type of communication signal is less likely to be affected by interference?
Digital
The part of the brain that processes visual information is the same as the part of the brain that processes emotions. True or False
False
The brain processes visual information in the occipital lobe and emotions in the amygdala
Surface waves move along the surface of two materials. They move both longitudinally and transversely. What two common waves are surface waves
Ocean/water waves
and
Seismic waves (Earthquakes)
Give 4 types of transverse waves
Water, Electromagnetic Waves (radio waves, x-rays, gamma Rays. microwaves, ultra Violet waves, Infrared), Waves on a string (ex - guitar)
As the energy of a wave increases what happens to its amplitude? Draw a graph of this relationship? What is the equation that makes this graph?
As energy increases amplitude increases as well. The graph will look like a curve that slopes up from zero. The equation is E=kA2
Which type of signal can carry more information? (Analog or Digital)
Digital
Motor (immediate)
Memory
Emotional
Define Diffraction and draw a diagram
When a wave moves through a opening and spreads out
Name 4 features in a mechanical wave and one example of a mechanical wave
Need a medium to travel through
Carries energy from one place to another
Can be longitudinal
Can be transverse
Can be reflected, transmitted, absorbed, refracted
Ex - water, sound, wave on a string, Earthquake (seismic), slinky
When a wave travels through a medium of a different density and changes direction, this is called what?
What is an example of this happening in real life?
Refraction
Ex - Making a rainbow From white light (rain drop or prism)
Seeing something underwater but when you grab for it, it is in a different place that it looked like
Why do they use radio waves to transmit digital information?
Because they travel very far at the speed of light and are safe.
Match the sensory receptor with the type of information it receives
Ears Chemical Information
Eyes Chemical Information
Touch Neurons Sound (pressure waves)
Nose (olfactory nerves) Pressure and Heat
Taste Buds Electromagnetic Waves
Ears Sound (pressure waves)
Eyes Electromagnetic Waves
Touch Neurons Pressure and Heat
Nose (olfactory nerves) Chemical Information
Taste Buds Chemical Information
When the energy of a wave is reduced as it moved through a medium and some of the energy is transferred to the medium this is know as what?
Absorption
Name 4 features of an Electromagnetic Wave and one example of an Electromagnetic wave
They can travel through a vacuum (space)
They carry energy from one place to another
They are all transverse
Travels at the speed of light
Can be reflected, transmitted, absorbed, refracted
Examples - Radio, Microwaves, Infrared, Visible Light, Ultraviolet, x-rays, Gamma rays
Two waves meet, they are in different phases (out of phase - trough to crest) the amplitude of each wave will do what?
Decrease
List 3 analog devices and 3 digital devices
Analog - vinyl record, magnetic tape (cassette tape), landline telephone
Digital - Computer processing, mp3 or 4, CDs, DVDs,
Put in order the correct stimulus Response Pathway when you hear a song you like and then begin to dance (legs dancing, brain interprets signals, ear "hears" music, motor Neurons tell your muscles to dance, ear translates sound into electrical signals, Message gets sent back through the nervous system to the legs)
Stimulus - the sound of the music -> The Ear 'hears" the music -> The ear translates the sound into electrical signals -> the brain interprets the signals -> Message gets sent back through the nervous system to the legs -> Motor neurons in the legs tell the muscles to dance -> you dance dance
Mechanical and Surface