AP Physics 2: Algebra-Based Flashcards: Periodic Waves
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
Define Wavelength (λ).
Wavelength is the distance between successive corresponding positions on a wave, such as from one peak to the next or one trough to the next.
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Define Wavelength (λ).
Wavelength is the distance between successive corresponding positions on a wave, such as from one peak to the next or one trough to the next.
If the frequency of a periodic wave increases, what happens to its period?
If the frequency increases, the period decreases because the two are inversely proportional (T = 1/f).
What is the mathematical relationship between a wave's period (T) and its frequency (f)?
The period of a wave is the reciprocal of its frequency, as described by the equation T = 1/f.
A periodic wave travels at 20 m/s and has a wavelength of 2 m. What is its frequency?
Using the equation v = λf, the frequency is f = v/λ, which is 20 m/s / 2 m = 10 Hz.
Describe the relationship between a wave's wavelength and its frequency, assuming its speed is constant.
For a wave with constant speed, the wavelength is inversely proportional to the frequency; as one increases, the other must decrease.
A wave has a frequency of 10 Hz. What is its period?
Using the equation T = 1/f, the period is 1/10 Hz, which equals 0.1 seconds.
How are a periodic wave's speed (v), wavelength (λ), and frequency (f) related?
The speed of a periodic wave is the product of its wavelength and frequency, given by the equation v = λf.
What are the two key properties used to describe the regular repetitions of a periodic wave?
The regular repetitions of a periodic wave are described using its period (T) and frequency (f).
What is a periodic wave?
A periodic wave is a wave that has regular repetitions in its pattern, which can be described by properties like period and frequency.
How does a change in frequency affect a wave's wavelength if its speed is proportional to wavelength?
Since v = λf, wavelength is inversely proportional to frequency. An increase in frequency results in a decrease in wavelength, assuming the wave's speed is constant.