Types of Waves According to Propagation
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Waves in Motion (Physics) for Grade 7 Students
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Types of Waves According to Propagation
- 2. WHICH AMONG THE THREE IS NOT A WAVE?1 2 3 ALL ARE EXAMPLES OF WAVES.
- 3. TYPES OF WAVES ACCORDING TO PROPAGATION Mr. Aaron F. San Jose Science & Technology 7
- 5. WAVE •A TRAVELLING DISTURBANCE THAT CARRIES ENERGY FROM PLACE TO PLACE WITH OR WITHOUT A MEDIUM.
- 7. DISTURBANCE
- 8. MEDIUM the substance that carries a wave (or disturbance) from one location to another.
- 9. TWO CLASSIFICATIONS OF WAVES •According to Propagation -Transverse Waves -Longitudinal Waves •According to Medium -Mechanical Waves -Electromagnetic Waves
- 10. TYPES OF WAVES ACCORDING TO PROPAGATION
- 11. TRANSVERSE WAVES •the movement of the particles of the medium is perpendicular (at a right angle) to the direction of propagation of the wave. •(ex. electromagnetic waves, rope waves, ocean waves)
- 12. PARTS OF TRANSVERSE WAVE CRES T TROUG H EQUILIBRIUM WAVELENGTH WAVELENGTH AMPLITUDE
- 13. LONGITUDINAL WAVES •Medium moves in the same direction as the wave’s motion •(ex. Sound waves, spring, slinky)
- 15. PARTS OF LONGITUDINAL WAVE C O M P R E S S I O N R A R E F A C T I O N
- 18. 1. WAVELENGTH •Symbol: λ •The distance between one point on a wave and the exact same place on the next wave.
- 19. 2. AMPLITUDE •The vertical distance of a wave
- 20. 3. FREQUENCY •Number of waves passing through a given point in one second •Unit: Hertz (Hz) •𝑓 = 𝑣 𝜆 •Where: •f = frequency •v = wave speed •Λ = wavelength
- 21. 3. FREQUENCY •SAMPLE PROBLEM #1 •A wave has wavelength of 10 m and a speed of 340 m/s. What is the frequency of the wave? • 𝑓 = 𝑣 𝜆 •𝑓 = 340 𝑚/𝑠 10 𝑚 •𝑓 = 𝟑𝟒 𝑯𝒛
- 22. 3. FREQUENCY (TRY THIS ONE!) •SAMPLE PROBLEM #2 •The speed of a wave is 65 m/sec. If the wavelength of the wave is 0.8 meters, what is the frequency of the wave? • 𝑓 = 𝑣 𝜆 •𝑓 = 65 𝑚/𝑠 0.8 𝑚 •𝑓 = 𝟖𝟏. 𝟐𝟓 𝑯𝒛
- 23. 3. FREQUENCY (TRY THIS ONE!) •SAMPLE PROBLEM #3 •A wave traveling at 230 m/sec has a wavelength of 2.1 meters. What is the frequency of this wave? • 𝑓 = 𝑣 𝜆 •𝑓 = 230 𝑚/𝑠 2.1 𝑚 •𝑓 = 𝟏𝟎𝟗. 𝟓𝟐 𝑯𝒛
- 24. 4. WAVE SPEED •Distance travelled by a given point of a wave, such as crest or trough, in a given interval •Unit: m/s •𝑣 = 𝑓 x 𝜆 •Where: •f = frequency •v = wave speed •Λ = wavelength
- 25. 4. WAVE SPEED •SAMPLE PROBLEM #1 •A wave has frequency of 50 Hz and a wavelength of 10 m. What is the speed of the wave? •𝑣 = 𝑓 x 𝜆 •𝑣 = 50 Hz x10 m •𝑣 = 500 m/s
- 26. 4. WAVE SPEED (TRY THIS ONE!) •SAMPLE PROBLEM #2 •A wave with a frequency of 14 Hz has a wavelength of 3 meters. At what speed will this wave travel? •𝑣 = 𝑓 x 𝜆 •𝑣 = 14 Hz x 3 m •𝑣 = 42 m/s
- 27. THOUGHTO PONDER
- 28. ISRAEL UK PORTUGAL GREECE SPAIN SWEDEN
- 29. SEATWORK: 1. A wave has a wavelength of 125 meters is moving at a speed of 20 m/s. What is its frequency? 2. A wave has a frequency of 46 Hz and a wavelength of 1.7 meters. What is the speed of this wave?
- 30. SEATWORK: •A wave has a wavelength of 125 meters is moving at a speed of 20 m/s. What is its frequency? • 𝑓 = 𝑣 𝜆 •𝑓 = 20 𝑚/𝑠 125 𝑚 •𝑓 = 𝟎. 𝟏𝟔 𝑯𝒛
- 31. SEATWORK •A wave has a frequency of 46 Hz and a wavelength of 1.7 meters. What is the speed of this wave? •𝑣 = 𝑓 x 𝜆 •𝑣 = 46 Hz x 1.7 m •𝑣 = 78.2 m/s
- 32. ASSIGNMENT •Read pages 244-249 of Science for the 21st Century Learner for preparation of tomorrow’s lesson. •Answer the wave problems given by your teacher
- 34. WHAT IS A TRANSVERSE WAVE? •the movement of the particles of the medium is perpendicular (at a right angle) to the direction of propagation of the wave. •(ex. electromagnetic waves, rope waves, ocean waves)
- 35. WHAT IS A LONGITUDINAL WAVE? •Medium moves in the same direction as the wave’s motion •(ex. Sound waves, spring, slinky)
- 36. PARTS OF TRANSVERSE WAVE CRES T TROUG H EQUILIBRIUM WAVELENGTH WAVELENGTH AMPLITUDE
Editor's Notes
- Usually the balls are close enough together to touch, and then if you move the left one farther left and let go, in a second or so the right one will pop up and out, come back down, hit the one next to it, and then the left one will go back to where you pulled it to a few seconds before. Air in a room looks rather like this. There are spaces between the balls, and there are balls on all ssides of the ones in the above diagram. When you push air molecules together (with a speaker cone, for instance, all the nearby molecules will crowd together and they act like rubber balls, so they get squeezed and then bounce back.
- It may be from oil, gas, or coal. Did you know that ocean waves could be used as an energy source too? Mechanical systems placed in the ocean or near the shore transform the energy from waves into electricity. Unlike oil, gas, or coal, the energy from ocean waves will not run out. Although wave energy technology is still very new, many scientists are optimistic about its possible use around the world. These creations are so wonderful that they should be respected or taken care of, if possible. God really is an amazing God!