Interpreting graphs
Referencing the graph from slide 25 - approximate the amplitude
~11 Pa
If a wave oscillates with a frequency of 105 Hz, determine the period.
Describe what happens to the period is the frequency is decreased to 10.5 Hz.
0.0095 sec
The period will increase by 10 to 0.095 sec
Draw a displacement vs. time graph that has a period of 1.5 s and an amplitude of 2 m. Label both axes and include units
Describe the difference between transverse and longitudinal waves and give at least one example of each
Transverse wave: A wave where the displacement of the particles are perpendicular to the direction the wave is traveling.
Ex: A guitar string
Longitudinal wave: A wave where the displacement of the particles are in the same direction the wave is traveling.
Ex: A sound wave
Referencing the graph on Slide 24 - determine the amplitude
2.25 m
Your friend stands at the opposite end to you on an American football field (110 m). You start your stopwatch when you see him clap and stop it when you hear the sound. Your stopwatch reads 0.32 seconds.
What is the approximate speed that the wave traveled through the air?
~343 m/s
For a wave on a string that has a wavelength of 1 m and amplitude of 2 m, draw a graph of the Displacement vs. Distance. Be sure to include correct acres and units
Describe what musical concepts amplitude and frequency relate to.
Amplitude: Directly relates to loudness
Frequency: Directly relates to the pitch
Referencing the graph on Slide 24 - Determine the period and frequency of the wave
7 seconds
0.14 Hz
A pulse on a 5 meter long string takes 2.7 seconds to travel from one end to the other. Assuming you oscillate that string at 2 Hz, calculate the wavelength.
0.9 m
For the situation presented on slide 26, draw what the string will look like at time t = 4.
Referencing the graph on slide 25.
Using this graph, calculate the frequency of oscillation assuming this is a sound wave traveling through air (v=343 m/s)
10.09 Hz
To image small organs in the body, ultrasound needs to have really small wavelengths (0.0015 m). If the ultrasound waves are traveling through tissue (v=1500 m/s), calculate the necessary frequency of the ultrasound wave as it passes through you.
If humans were made of air (v=343 m/s) instead, would you need a larger are smaller frequency?
1,000,000 Hz
Smaller (~228,000 Hz)
A wave travels down a string (length 4 m) with a speed of 100 m/s, a frequency of 50 Hz, and an amplitude of 1 m. If you take a snapshot at a moment in time, draw a Displacement vs. Distance graph. Be sure to include your axes with correct units
Imagine you have a string that you are holding at one end. You shake the string up and down at a certain frequency, which produces a wave with a certain wavelength. What happens to the wavelength if I increase the frequency I'm driving the string?
Bonus: What happens to that wavelength if I increase the tension in the string?
The wavelength will decrease
Bonus: The speed will increase, which means the wavelength will also have to increase