17 2 Properties of Mechanical Waves A surfer

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17. 2 Properties of Mechanical Waves A surfer needs to understand the properties of

17. 2 Properties of Mechanical Waves A surfer needs to understand the properties of waves.

17. 2 Properties of Mechanical Waves Frequency and Period Any motion that repeats at

17. 2 Properties of Mechanical Waves Frequency and Period Any motion that repeats at regular time intervals is called________motion. • The time required for one cycle is called the _______(T). • _____(f) is the number of complete cycles in a given time. • Frequency is measured in cycles per second, or _______(Hz).

17. 2 Properties of Mechanical Waves Frequency and Period Frequency = 1. 0 hertz

17. 2 Properties of Mechanical Waves Frequency and Period Frequency = 1. 0 hertz One cycle per second A. A wave vibrating at one cycle per second has a frequency of 1. 0 Hz. B. A wave vibrating at two cycles per second has a frequency of 2. 0 Hz. Frequency = 2. 0 hertz Two cycles per second

17. 2 Properties of Mechanical Waves § _____(λ) is the distance between a point

17. 2 Properties of Mechanical Waves § _____(λ) is the distance between a point on one wave and the same point on the next cycle of the wave § Increasing frequency of a wave________its wavelength. § ________wave: wavelength is measured between adjacent crests or between adjacent troughs § _______wave: wavelength is the distance between adjacent compressions or rarefactions

17. 2 Properties of Mechanical Waves Wavelength can be measured from any point on

17. 2 Properties of Mechanical Waves Wavelength can be measured from any point on a wave to the same point on the next cycle of the wave. Long wavelength Rest position Short wavelength

17. 2 Properties of Mechanical Waves • The_________of a wave is the maximum displacement

17. 2 Properties of Mechanical Waves • The_________of a wave is the maximum displacement of the medium from its rest position. –The more energy, the greater is its ________ –The more energy, the more the medium will be compressed or ________ –Transverse wave: distance from the rest position to a crest or a trough –Longitudinal wave: maximum displacement of a point from its rest position

17. 2 Properties of Mechanical Waves Wave Speed • When wavelength is in meters,

17. 2 Properties of Mechanical Waves Wave Speed • When wavelength is in meters, and frequency is in hertz (1/s), the units for speed are m/s. • _______ • Speed of a wave can change if it enters a new medium, or if variables such as pressure and temperature change.

17. 2 Properties of Mechanical Waves Wave Speed of Mechanical Waves One end of

17. 2 Properties of Mechanical Waves Wave Speed of Mechanical Waves One end of a rope is vibrated to produce a wave with a wavelength of 0. 25 meter. The frequency of the wave is 3. 0 hertz. What is the speed of the wave?

17. 2 Properties of Mechanical Waves Wave Speed 1. A wave on a rope

17. 2 Properties of Mechanical Waves Wave Speed 1. A wave on a rope has a wavelength of 2. 0 m and a frequency of 2. 0 Hz. What is the speed of the wave?

17. 2 Properties of Mechanical Waves Wave Speed 2. A motorboat is tied to

17. 2 Properties of Mechanical Waves Wave Speed 2. A motorboat is tied to a dock with its motor running. The spinning propeller makes a surface wave in the water with a frequency of 4 Hz and a wavelength of 0. 1 m. What is the speed of the wave?

17. 2 Properties of Mechanical Waves Wave Speed 3. What is the speed of

17. 2 Properties of Mechanical Waves Wave Speed 3. What is the speed of a wave in a spring if it has a wavelength of 10 cm and a period of 0. 2 s?

17. 2 Properties of Mechanical Waves Wave Speed 4. What is the wavelength of

17. 2 Properties of Mechanical Waves Wave Speed 4. What is the wavelength of an earthquake wave if it has a speed of 5 km/s and a frequency of 10 Hz?

17. 2 Properties of Mechanical Waves Assessment Questions 1. While wading in shallow waters,

17. 2 Properties of Mechanical Waves Assessment Questions 1. While wading in shallow waters, six waves crash into your legs in a 24 -second span. What is the frequency of the waves? a. b. c. d. 4 Hz 18 Hz 0. 25 Hz 2 Hz

17. 2 Properties of Mechanical Waves Assessment Questions 2. What is the speed of

17. 2 Properties of Mechanical Waves Assessment Questions 2. What is the speed of an earthquake wave if it has a wavelength of 2. 3 km and a frequency of 3 Hz? a. b. c. d. 6. 9 km 5. 3 km 6. 0 km 1. 3 km

17. 2 Properties of Mechanical Waves Assessment Questions 3. Which wave property increases as

17. 2 Properties of Mechanical Waves Assessment Questions 3. Which wave property increases as the energy of a wave increases? a. b. c. d. period frequency wavelength amplitude

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