Vocabulary
A rhythmic disturbance that carries energy from one place to another is known as....
Waves
What are the 2 main types of waves we learned about in class?
Transverse and Longitudinal
List one use for understanding waves in the real world
- Communication, Wifi, Cell Phones, understanding ocean behavior, etc.
If I increased the amplitude of a sound wave, what would happen?
The sound would become louder.
A wave with a low frequency will have a
High amplitude
The measurement from crest to crest on a wave, or compression to compression
Wavelength
A mirror is a great example of a _______ since light waves hit the mirror and bounce back
reflection
Refraction.
What is the only way to change a wave's speed/velocity?
A change in medium
Give one real-life example each of a transverse wave and a longitudinal wave. Briefly explain why each fits its category.
Transverse- Light waves
Longitudinal- Sound waves.
__________ tells us how much energy the wave is carrying.
Amplitude
In transverse waves, amplitude is measured by _________ of the wave, while in longitudinal waves it is measured by the _______ of the compression in the wave
height, width
A laser hits a mirror at an angle of 54 degrees. If this is true, what is the angle of the reflected ray?
54 Degrees
A wave has a wavelength of 2 meters and a frequency of 5 Hz. How fast is the wave traveling?
2 m x 5Hz= 10m/s
A wave is traveling at 500 m/s. The wave is vibrating 20 times every second. With this information, calculate the distance between crests.
500 m/s / 20Hz= 25 m
In a longitudinal wave, where particles are close together is known as a ____________, while areas where particles are spread apart are known as __________
1) Compression, 2) Rarefaction
Which wave type's energy runs perpendicular to its wave motion?
Describe the relationship between wavelength and frequency.
They are inversely proportional- meaning as one increases the other decreases. We see this is true because increasing frequency would make the waves closer together, which automatically decreases the distance between crests.
You are standing by a lake and shout. The sound bounces off a cliff and returns to you a moment later.
This is an echo, which is a reflected sound wave.
You see a lightning bolt and hear the thunder several seconds later. Using your knowledge of wave types and speed, explain why this happens.
Light waves move faster than sound waves in gases. Sound waves travel slower through gases since there are less particles to keep the wave moving. Light waves do not need a medium to travel, so gases are not the MOST efficient but are still faster than sound waves.
A student plays music in one room and leaves. He turns left and goes all the way down the hall to the bathroom, but he can still hear the music. Why is this?
Diffraction allows for the bending of waves through an opening. Diffraction allows the sound waves to leave the room and travel out to where you can hear down the hallway.
State the Law of Reflection
The angle of incidence is always equal to the angle of reflection
Why do rainbows happen after it rains? Explain using vocabulary we have used in class.
When it rains there is excess moisture in the air. The sun rays hit these water droplets and cause refraction where all colors are shown due to bending. These colors are then reflected down to Earth to be seen by the human eye.
Draw and label a transverse wave with the following:
Crest, Trough, Normal Line, Amplitude, Wavelength, Frequency.
Crest- top of wave
Trough- Bottom of wave
Amplitude- Rest to Crest
Wavelength- Distance between crests
Frequency- May vary
A student claims that “If you make a sound in space, someone on the other side of the spaceship will hear it right away.” Do you agree or disagree? Justify your answer using evidence about how waves travel.
This is incorrect. Sound waves need a medium of some sort to travel. In space there is nothing (a vacuum) so even if you COULD hear someone it would not be right away and would take much longer to get to you than on Earth