1. Calculating Wave Speed

2. Wave Speed v f λ

3. Practice Problem #1
What is the speed of a sound wave that has a wavelength of 2 m and a frequency of Hz?
v = f x λ
170.5 Hz x 2 m =
341 m/s

4. Practice Problem #2
A wave traveling in water has a frequency of 500 Hz and a wavelength of 3 m. What is the speed of the wave?
v = f x λ
500 Hz x 3 m =
1,500 m/s

5. Practice Problem #3
The lowest-pitched sounds humans can hear have a frequency of 20 Hz. What is the wavelength of these sound waves if their wave speed is 340 m/s?
λ = v / f
340 m/s / 20 Hz =
17 m

6. Practice Problem #4
The highest-pitched sound humans can hear have a wavelength of m in air. What is the frequency of these sound waves if their wave speed is 340 m/s?
f = v / λ
340 m/s / 0.017m =
20,000 Hz

7. Practice Problem #5
Calculate the frequency of a water wave that has a wavelength of 0.5 m and a speed of 4 m/s.
f = v / λ
4 m/s / 0.5 m =
8 Hz

8. Practice Problem #6
An FM radio station broadcasts radio waves with a frequency of 100,000,000 Hz. What is the wavelength of these radio waves if they travel at a speed of 300,000 km/s?
λ = v / f
300,000 km/s / 100,000,000 Hz =
0.003 km