Mechanical Waves
Define a Mechanical Wave
a Mechanical wave transfers energy through matter
Define an EMS Wave
Light travels in ___________ lines
straight
What is the wave equation?
Velocity= Wavelength (Frequency)
In the analog/ digital lab, what did tapping the phone model represent? What did talking through the phone model represent?
Tapping= Digital Signals
Talking= Analog Signals
Draw a Transverse wave
Label Amplitude, Wavelength, crest and trough
see image
List the EMS waves from lowest frequency to highest frequency
Radio, micro, infared, visible, ultraviolet, x-ray, gamma
2 waves with opposite amplitudes collide. What do you expect to happen?
What is this phenomena called?
The waves will cancel out, this is called destructive interference
Which equation would I use to solve for frequency
Frequency= Velocity/wavelength
Noise and interference easily overpowers _____ signals, making them less reliable.
analog signals
Draw a compressional/ longitudinal wave
Label wavelength, rarefaction, and compression
see image
Which type of waves can we see?
List the colors in order from lowest frequency to highest frequency
Visible
Red, Orange, Yellow, Green, Blue, Indigo, Violet
(ROY G BIV)
Compare and contrast:
Diffraction and Refraction
Compare: Both cause light to bend
Contrast: Diffraction is around an object, refraction is through an object
Solve:
A wave is traveling at 144 m/s with a frequency of 40 Hz. What is the wavelength with the correct units?
3.6 m
What is binary code?
Which signal uses binary code?
a pattern only using 2 values, 1 and 0
Digital signals
Sound is a ______________ wave.
How does it travel from a source to your brain?
compressional
vibrates matter (air, liquid or solid) causes vibrations in your inner ear to send information to the brain
When it is very sunny outside, we wear sunblock. Which EMS wave does the sunblock mainly protect your cells from?
UV Rays
If a movie theater wants to have the loudest sound system, which kind of interference should they try to use and why?
Constructive interference because combining amplitudes will increase energy and make a louder sound system
How is frequency and velocity wave equation related?
Increase frequency, increase speed
Directly proprotional
The _______ of a device is the part that produces or sends out information using waves
The _______ is the part of the device that detects radio waves change changes it back to other types of waves
transmitter
receiver
What causes a sonic boom?
What is the relationship between wavelength and frequency?
As wavelength increases, frequency decreases
Inversely proprotional
When someone is farsighted, their focal point occurs after the retina. Which lens type would they use and why?
Convex
To refocus the light, cause it to bend and place the focal point on top of the retina
Compare and Contrast
Wavelength and Period
Contrast: wavelength measures distance, period measures time
In an emergency, fire trucks need to arrive to the location quickly, but sometime get stopped behind red lights.
What is a solution using waves to prevent this issue?
1. Red lights that detect the flashing visible or infared waves when the truck is approaching
2. Truck sends radio waves out to the stoplight to change the signal from red to green