Every wave obeys one tidy rule that ties together how fast it moves, how often it wiggles, and how long each wiggle is. Pin down any two and the third follows at once.
The wave speed equals the frequency multiplied by the wavelength: v = f times wavelength. At a fixed speed, raising the frequency shortens the wavelength, and lowering it lengthens the wavelength.
The wave equation states that the wave speed equals the frequency multiplied by the wavelength.
Rearranged: f = v ÷ λ and λ = v ÷ f.
Adjust the frequency and wavelength and watch the wave speed that results.
Four quick checks. Each correct answer earns XP and lights this skill on your star map.
The wave equation is...
In the wave equation, wave speed equals...
At a constant wave speed, if the frequency increases the wavelength...
To find the wavelength from speed and frequency you use...
Knowing any two of speed, frequency and wavelength gives you the third.
A wave has a frequency of 50 Hz and a wavelength of 2.0 m. Find its speed.
Keep the units consistent and rearrange with care. To find wavelength, divide speed by frequency; to find frequency, divide speed by wavelength. Mixing these up is the most common slip.
Unlocks once the four checks above are done. Worth more XP, written in the style of Paper 2.
A wave has a frequency of 50 Hz and a wavelength of 2.0 m. Its speed is...
A sound wave travels at 340 m/s with a frequency of 170 Hz. Its wavelength is...
Water waves of wavelength 0.50 m pass a post at 4.0 waves per second. Their speed is...
Two wave skills down. Keep the chain going.