Although it may seem like it, a wave’s frequency and its speed are not the same. Picture yourself standing on the side of a road. A line of semitrucks is driving by you at 60 kilometers per hour. You time the semitrucks as they go by and notice that one truck passes you each second. Suddenly, the line of semitrucks ends and a line of small cars drives by you also going 60 kilometers per hour. You time the cars and notice that two cars pass you every second. Even though the speed of the trucks and cars is the same (60 kilometers per hour), more cars are passing you per second than trucks. Why? The answer is because the cars are shorter than the trucks; therefore, more of them can pass you by in the same amount of time.

a. What does the number of vehicles (cars or trucks) passing you each second represent?

b. What part of the wave would the length of the vehicles represent?

c. If two waves travel at the same speed but one has a shorter wavelength, what must happen to its frequency?

a. A line of semitrucks is driving at 60 km/h . One truck passes each second and two cars passes every second. The speed of the truck and car is same.

According to the arrangement of vehicles, the number of car or truck passing by each second is the space in between the waves.

Thus, the number of vehicles (cars or trucks) passing you each second represent the space in between the waves.

b. The cars are considered as small wave and trucks are the longer waves, their length is equal to the time period and also shows the frequency.

Thus, the wave would the length of the vehicles represent frequency.

c. The wavelength is inversely proportional to the frequency. This concludes that at same speed , shortening the wavelength will increase the frequency.

Thus, if two waves travel at the same speed but one has a shorter wavelength, its frequency gets higher.

Learn more about frequency.

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