Wave Properties: Frequency, Amplitude, and Wavelength
Describing how waves move and transfer energy
Wave Properties: Frequency, Amplitude, and Wavelength
Describing how waves move and transfer energy
Physics - Grade 6-8
- 1
Define frequency in your own words.
Think about how often the wave repeats.
Frequency is the number of wave cycles that pass a point in a certain amount of time. A higher frequency means more waves pass by each second. - 2
Define amplitude in your own words.
Amplitude is the height of a wave from its resting position to its crest or trough. A larger amplitude means the wave carries more energy. - 3
Define wavelength in your own words.
Look for the length of one full repeating pattern.
Wavelength is the distance between matching points on two waves, such as crest to crest or trough to trough. It shows how long one complete wave is. - 4
A wave on a rope has very tall crests and deep troughs. Describe its amplitude.
The wave has a large amplitude because the crests and troughs are far from the resting position. - 5
Two sound waves are compared. Wave A repeats 10 times in one second, and Wave B repeats 4 times in one second. Which wave has the greater frequency?
Frequency counts how many cycles happen in a given time.
Wave A has the greater frequency because it repeats more times in one second than Wave B. - 6
Two water waves travel the same distance. Wave X has crests that are closer together than Wave Y. Which wave has the shorter wavelength?
Wave X has the shorter wavelength because its crests are closer together. - 7
A student says that increasing amplitude changes how much energy a wave carries. Is the student correct? Explain.
Think about whether taller waves are carrying more or less energy.
The student is correct. Increasing amplitude means the wave carries more energy. - 8
If the frequency of a wave increases while the wave speed stays the same, what happens to its wavelength?
The wavelength decreases. When more waves pass by in the same amount of time at the same speed, each wave must be shorter. - 9
A wave has a wavelength of 2 meters. This means the distance from one crest to the next crest is how far?
Wavelength measures the distance between matching points on waves.
The distance from one crest to the next crest is 2 meters because wavelength is the length of one complete wave cycle. - 10
Compare these two waves: Wave 1 has a large amplitude and low frequency. Wave 2 has a small amplitude and high frequency. Describe one difference between them.
One difference is that Wave 1 is taller while Wave 2 repeats more often. This means Wave 1 has greater amplitude, and Wave 2 has greater frequency. - 11
A tuning fork produces a sound wave with a higher frequency than another tuning fork. How will the sound usually be perceived?
For sound, frequency is related to pitch.
The sound will usually be perceived as having a higher pitch because higher frequency sound waves produce higher pitches. - 12
Explain how frequency, amplitude, and wavelength are different from one another.
Frequency tells how often a wave repeats, amplitude tells how tall the wave is from its resting position, and wavelength tells the length of one complete wave. These properties describe different features of the same wave.