uesday, May 17,2016 itting stationary on the end of a dock that juts out into a
ID: 779100 • Letter: U
Question
uesday, May 17,2016 itting stationary on the end of a dock that juts out into a lake, you observe water Problem 3: While waves that are passing by your position. You measure the distance between successive w be 1.2 m and they are traveling with a speed of 3.0 m/s Part A) Calculate the frequency of the waves Part B) Calculate the period of the waves Problem 4: Light from a red laser travels at the speed of light, 3 x 10* m/s, and has a wavelength of 700 x 109 m. Calculate its frequency and its period.Explanation / Answer
3.
Wave speed = 3m/s
Wavelength = 1.2m
A) frequency = wave speed/wavelength = 3/1.2 =2.5 s-1
B) Time period = 1/frequency = 1/2.5 = 0.4 seconds
4. wavelength = 700 x 10-9 m
Speed = 3 x 108 m/s
Frequency = speed / wavelength = 3 x 108/(700 x 10-9 ) = 4.3 x 1014 Hz
Time period = 1/frequency = 1/(4.3 x 1014) =2.33 x 10-15 s
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