physics

Name: _________________________
Section:_____
Date:__________
Wave Speed Equation Practice Problems
The formula we are going to practice today is the wave speed equation:
w ave speed=wavelength*frequency
v  f
Variables, units, and symbols:
Quantity
Symbol
Quantity
Term
Unit Unit
Symbol
v wave metsepres/esde cond m/s
 wavelength meter m
f frequency Hertz Hz
Remember:
frequency: number of complete waves passing a point in a given time
f  number of cycles
t
 If 10 waves pass in 1 second, the frequency is 10 Hz
 If 6 waves pass in 2 seconds, the frequency is 3 Hz
Sample Problems:
Sample Problem 1) A wave has frequency of 50 Hz and a wavelength of 10 m. What is the speed
of the wave?
f  50 Hz
  10 m
v  ?
v =  f = 10 m 50 Hz 500m
s
Sample Problem 2) A wave has frequency of 5 Hz and a speed of 25 m/s. What is the wavelength
of the wave?
f  5 Hz
v  25 m
s
 = ?
v =   f   = v
f
 25 m s
5 Hz
 5 m
Sample Problem 3) A wave has wavelength of 10 m and a speed of 340 m/s. What is the
frequency of the wave?
  10 m
v  340 m
s
f = ?
v    f  f = v

 340 m s
10 m
 34 Hz
Problems for you to try: Complete the following practice problems. You MUST
show ALL the work outlined in the steps in the example problems.
1. A wave with a frequency of 14 Hz has a wavelength of 3 meters. At what speed will this
wave travel?
2. The speed of a wave is 65 m/sec. If the wavelength of the wave is 0.8 meters, what is the
frequency of the wave?
3. A wave has a frequency of 46 Hz and a wavelength of 1.7 meters. What is the speed of this
wave?
4. A wave traveling at 230 m/sec has a wavelength of 2.1 meters. What is the frequency of
this wave?
5. A wave with a frequency of 500 Hz is traveling at a speed of 200 m/s. What is the
wavelength?
6. A wave has a frequency of 540 Hz and is traveling at 340 m/s. What is its wavelength?
7. A wave has a wavelength of 125 meters is moving at a speed of 20 m/s. What is it’s
frequency?
8. A wave has a frequency of 900 Hz and a wavelength of 200 m. At what speed is this wave
traveling?
9. A wave has a wavelength of 0.5 meters and a frequency of 120 Hz. What is the wave’s
speed?
10. Radio waves travel at a speed of 300,000,000 m/s. WFNX broadcasts radio waves at a
frequency of 101,700,000 Hertz. What is the wavelength of WFNX’s radio waves?