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G10 Waves P1

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A set of slides created to teach G10 Waves P1 to learners at Bishops Diocesan College in Cape Town.

A set of slides created to teach G10 Waves P1 to learners at Bishops Diocesan College in Cape Town.

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Transcript

  • 1. Waves Keith Warne
  • 2. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Transverse Pulse • A pulse is a ………. ……………….. in a medium. • A transverse pulse has the disturbance at ………… to the direction of movement. • The pulse shownmoves from left to right across the medium. • The particles of the medium move UP and DOWN.
  • 3. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Transverse Pulse • The pulse length () would be from the …………. to the …………………………... • The amplitude (A) is the ……………………… from position of ………... ………………………….. ……………………………
  • 4. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Longitudinal Pulse Longitudinal Pulse The disturbance is in the ……………………… as the wave motion. The particles vibrate………………………to the wave's velocity.
  • 5. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Displacement - time • Draw graphs of transverse position (y) vs time vs t, for a particle of a string or spring as a pulse move past it.
  • 6. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Displacement - time • Draw graphs of transverse position (y) vs time vs t, for a particle of a string or spring as a pulse move past it. Time (s) + - y y
  • 7. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Displacement - time • Draw graphs of transverse position (y) vs time vs t, for a particle of a string or spring as a pulse move past it. Time (s) + - y
  • 8. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Graphs of motion • Graphs of transverse position (y) vs time (y vs t) and velocity vs time (v vs t) , for a particle of a string or spring as a pulse moves past it. Time (s) + - y Time (s) + y -
  • 9. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Reflection of Pulses • …………………. takes place at a fixed end. • ……………………takes place at a free end. Fixed end Free end
  • 10. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Vibrations • Equilibrium position – B • Points of maximum displacement. A & C • Amplitude = distance from …………… position to point of …………….. displacement. • One full vibration. ……………………….. • Period (T) - time taken for one full vibration. (s) • Frequency (f) - number of full vibrations in one second. (Hz - vib/s) Vibrating Stick A B C period = …………… …………… frequency = …………… …………… T = …. ….
  • 11. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Pendulum • Velocity -time and acceleration time graphs for a pendulum motion. • Indicate the points A, B and C on these graphs. Time (s) Time (s) Time (s) A BC If a pendulum completes 12 full cycles in 3s. Calculate: frequency = ……………………… period = …………………………..
  • 12. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Transverse Waves Transverse Waves The disturbance is at 90o to the direction of movement. The particles vibrate perpendicular to the wave's velocity.
  • 13. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Frequency. waves time = 1.5wvs/1sec = 1.5 Hz Period. T = time/waves = 1 second/1.5waves = 0.66 s/wv Amplitude = 0.04m Transverse Wave One second ƒ= 4 cm One wave Half wave
  • 14. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Longitudinal Waves ……….……… ………………… A Longitudinal wave is a series of ……………………….. and ………………………………… that move through a medium. The DISTURBANCE is in the ……………………………….. as the direction of the wave (pulse).
  • 15. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Speed of the wave. • Symbol  (“…….”) - the ……………moved by any pulse in one ……………... • Units meters per second (……….). Speed = ………… x ……………….  = … x …. = ……………… = ………. …….. Transverse Wave - speed One second  = 5.5mm  = ƒ x  1/2  f = waves time = 1.5 1 = 1.5 Hz
  • 16. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Comparison wavelength
  • 17. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Interference 1 c) The pulses continue on their original paths. When two pulses arrive at the same point at the same time they combine into a single pulse with …………… the amplitude.
  • 18. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Interference 1 Constructive Interference • When a pulse and another pulse meet at a point • Displacements add up • A antinode (point of double displacement) is produced.
  • 19. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Double Source interference
  • 20. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Double slit interference
  • 21. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net
  • 22. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Standing Waves Fundamental frequecy fo f2 = ….. fo f 3= ……fo f4 = ….. fo f5 = …… fo fn = ….. fo  = 2 L  = ……L  = ……L  = ……L  = ……L  = ……L L ….. ….. …… …. …… …… L = ………
  • 23. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Properties of waves • Reflection - waves bouncing off a surface • Refraction - waves bending as they pass through a different medium. • Interference - waves interfering as they pass through another wave.
  • 24. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Reflection • Waves ………. (bounce) off the surface of objects in their paths. • The angle that waves are ………. (hit) the surface is the same as that with which they ……….off again. Angle of incidence
  • 25. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Refraction of waves • Waves ……………on entering a more dense medium. • If a wave strikes this medium at an ……………it then changes direction. Normal line 90° to the surface The wave bends …………………… the normal on entering a more dense medium at an angle. The waves bend ………………. ……………… the normal when exiting a more dense medium.
  • 26. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Hi - This is a SAMPLE presentation only. My FULL presentations, which contain a lot more more slides and other resources, are freely available on my resource sharing website: www.warnescience.net (click on link or logo) Have a look and enjoy! WarneScience