The Period, or the time it takes for wave to complete on wavelength, is related to ____________ Frequency.

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Presentation transcript:

The Period, or the time it takes for wave to complete on wavelength, is related to ____________ Frequency

A wave has a frequency of 40 hertz. What is the period of the wave? Know: Find: Formula: Answer: f = 40hertz Period T = 1/ f T = 1/f = 1/40 = 0.025s

A wave has a period of 2 seconds. What is the frequency of the wave? Know: Find: Formula: Answer: T = 2s frequency f = 1/ T f= 1/T = 1/2 = 0.5Hz

The only thing that affect wave speed is the medium We can use two properties of a wave to calculate the speed: Frequency- (how many waves per second) Wave Length- (distance between waves)

Finding Speed of a Wave

Know: Find: Formula: Answer: f = 40hertz ƛ = 0.5m v = fƛ The wavelength for a wave is 0.5 meter, and its frequency is 40 hertz. What is the speed of the wave? Know: Find: Formula: Answer: f = 40hertz ƛ = 0.5m Speed v = fƛ v = 40hrtz x 0.5m = 20m/s

The period of a wave is 10 seconds and the wavelength is 2 meters The period of a wave is 10 seconds and the wavelength is 2 meters. What is the wave speed? Know: Find: Formula: Answer: T = 10s ƛ = 2m Wave Speed v = f ƛ v = f ƛ = f = 1/T = 1/10 = 0.1hz v = 0.1hrtz x 2m = 0.2m/s

Can rearrange formula to solve for either frequency or wavelength

A sound wave has a speed of 400m/sec and a frequency of 200Hz A sound wave has a speed of 400m/sec and a frequency of 200Hz. What is its wavelength? Know: Find: Formula: Answer: v = 400m/s f= 200Hz Wavelength v =fƛ v/f = fƛ / f ƛ = v/f = 400/200 =2m

Summarizer: Try these on your own!

Johnny is making waves on a slinky. It takes 0 Johnny is making waves on a slinky. It takes 0.5s for one complete wavelength. The wavelength of the waves is 2m. What is the speed of the waves John-boy made?

Johnny now creates waves with a speed of 3m/s, with a wavelength of 0 Johnny now creates waves with a speed of 3m/s, with a wavelength of 0.25m. What is the frequency of the waves? What is the period of the waves?