Basics
Resonance
Sound Waves
Standing Waves
Wild Card
100
This is the part of a wave that is measured from crest to crest, or trough to trough, or from any point on a wave to the next time that point appears.
What is the wavelength?
100
This is the type of interference that causes resonance.
What is constructive interference?
100
Sound is this type of wave.
What is longitudinal?
100
This is the number of nodes and antinodes present in the first (fundamental) harmonic.
What is 2 nodes and 1 antinode?
100
How old is Mr Janzen?
26!
200
This type of wave is made of particles oscillating parallel to the motion of the wave.
What is a longitudinal wave?
200
Noise cancelling headphones get rid of sound by utilizing what phenomenon?
What is destructive interference?
200
These are the two parts of a sound wave, associated with the crest and trough respectively.
What are compression and rarefaction?
200
Standing waves are caused by this process.
What is interference?
200
This is the phenomenon when a wave source and an observer are moving relative to each other, causing the perceived wave to have a higher or lower frequency than the source.
What is the Doppler Effect?
First Hand $100: What are two situations that would result in a lower-frequency perceived wave?
300
This is the only way to change the wave speed of a mechanical wave.
What is changing the tension/density of the material?
300
Resonance occurs when a forced vibration matches an object's...
What is natural frequency?
300
This phenomenon occurs when two frequencies, which are close but not identical, are played near each other.
What are beats?
First Hand $100: What part of the waves is caused to oscillate to create beats?
300
A harmonic frequency is obvious because it causes this part of the wave to dramatically increase.
What is amplitude?
300
A beat frequency is the result of two slightly different frequencies shifting back and forth between these two states.
What is constructive and destructive interference?
First Hand $100: Which one of these is responsible for the sounds getting quieter?
400
A wave with a frequency of 150Hz and a wavelength of 0.7m has this wave speed.
What is 105m/s?
First Hand $100: How many antinodes would be present on a 1.4m string?
400
A tube resonates with a fundamental frequency of 40Hz. This is the harmonic level of a sound that resonates with a frequency of 240Hz.
What is the 6th level harmonic?
First Hand $100: How many complete wavelengths would this harmonic wave have?
400
A student stands at the edge of a canyon and shouts toward the bottom. If they hear their echo after 0.8 seconds, and they know the speed of sound is 340m/s in air, how deep is the canyon?
What is 136 meters deep?
First Hand $100: Later that night, when the sun has set, the student returns, and it takes 0.9 seconds for their echo. Why would the echo take longer at night?
400
This is why it's dangerous for a bridge to have a natural frequency that matches the vibration of an earthquake.
Because the earthquake would resonate with the bridge and create a standing wave on the bridge, making it amplify its vibrations and probably collapse.
400
This wave interaction will result in this type of interference.
What is destructive interference?
First Hand $100: What will the rope look like when the waves are in the same place?
500
A singer's voice travels 50m in 0.15 seconds to reach an audience member. That person experiences 14 waves in 0.03 seconds. What are the wave speed, frequency, and wavelength?
Wave speed = 333.3m/s
Frequency = 466.6Hz
Wavelength = 0.714m
500
A very narrow tube that is 0.5 meters long resonates at its fundamental frequency with a mystery sound. Sound travels at 340m/s. This is the mystery frequency.
What is 340Hz?
500
This wave data took 0.03 seconds. Calculate the period and frequency.
What is Period = 0.0025s and Frequency = 400Hz?
500
A 0.7m violin string is played and it vibrates at the 7th harmonic. This is the frequency of the note assuming the speed of sound is 340m/s.
What is 1700Hz?
500
Mechanical Waves transfer this, but not this.
What is energy but not matter?