Do Now: Identify the type of wave Click to replay

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Presentation transcript:

Do Now: Identify the type of wave Click to replay

OBJECTIVE: distinguish between frequency and wave speed & calculate the speed of a wave 25.3 Wave Motion

Most information gets to us in some form of wave. Sound Light Radio and Television 25.3 Wave Motion

When energy is transferred by a wave from a vibrating source to a distant receiver, no matter is transferred between the two points. The disturbance moves, not parts of the string itself Wave Motion

In water waves, it is the disturbance that moves, not the water Wave Motion

Sound waves are a disturbance in the air that travels to your ears, but the air doesn’t move Wave Motion

The speed of a wave depends on the medium through which the wave moves. Whatever the medium, the speed, wavelength, and frequency of the wave are related Wave Speed

If the wavelength is 1 meter, and one wavelength per second passes the pole, then the speed of the wave is 1 m/s Wave Speed

If the wavelength is 3 meters and if two crests pass a stationary point each second, then 3 meters × 2 waves pass by in 1 second. The waves therefore move at 6 meters per second. v = f v is wave speed, is wavelength, f is wave frequency Wave Speed

In air, the product of wavelength and frequency is the same for every frequency of sound. That’s why you don’t hear the high notes in a chord before you hear the low notes. The sounds all reach you at the same time. Long wavelengths have low frequencies, and short wavelengths have high frequencies Wave Speed

Wavelength and frequency vary inversely to produce the same wave speed in air for all sounds Wave Speed In fresh water, sound waves travel at 1482 m/s

think! If a water wave vibrates up and down two times each second and the distance between wave crests is 1.5 m, what is the frequency of the wave? What is its wavelength? What is its speed? 25.4 Wave Speed

think! What is the wavelength of a 340-Hz sound wave when the speed of sound in air is 340 m/s? 25.4 Wave Speed