General Properties Of Waves
Bayani Gaba-gaba
Drop a pebble into a still pond and something strange happens. Rings race outwards across the surface, faster than you could swim, and a leaf floating two metres away lifts, tips and settles back down. The leaf does not travel. It ends the afternoon exactly where it began. Yet something crossed those two metres of water, because the leaf moved and it was the pebble that moved it. Whatever made that journey carried no water with it at all.
That is the idea this lesson is built on, and it is one of the most useful in the whole of physics. The same description covers the ripple on the pond, the note from a guitar, the light reaching your eye from this page and the signal your phone pulled out of the air a moment ago. You will learn what a wave actually is and what it carries, the five words physicists use to measure one, the single equation that ties speed, frequency and wavelength together, and what happens when a wave stops having a clear run and arrives at the edge of a different material. By the end you will be able to work out the speed of a ripple from a stopwatch and a ruler, and to say why you can see your own reflection in a window at night while the person inside is reading comfortably by the very lamp you are looking past.
Manufura
- A wave is a disturbance caused by an oscillating source that transfers energy and information in the direction of wave travel, without transferring matter.
- Waves can be reflected, transmitted or absorbed (or a combination of these) at the boundary between two different materials.
- Wave motion can be described in terms of their frequency, wavelength, period, amplitude and wavefront. Students should be able to explain the meaning of these terms.
- The relationship between wave speed, v, frequency, f, and wavelength, λ, is:
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Barka da kammala darasi akan General Properties Of Waves. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- What does a wave transfer from its source? A. Matter only B. Energy and information, but not matter C. Matter and energy together D. Mass but not energy Answer: B
- Which quantity is measured from the undisturbed position of the medium out to the maximum displacement? A. Wavelength B. Period C. Amplitude D. Frequency Answer: C
- A wave has a frequency of 50 Hz and a wavelength of 6.0 m. What is its speed? A. 0.12 m/s B. 8.3 m/s C. 56 m/s D. 300 m/s Answer: D
- A wave has a period of 0.25 s. What is its frequency? A. 0.25 Hz B. 4.0 Hz C. 25 Hz D. 400 Hz Answer: B
- Which list gives the three things that can happen to a wave at the boundary between two different materials? A. Reflection, transmission, absorption B. Frequency, wavelength, amplitude C. Reflection, oscillation, period D. Absorption, wavefront, wave speed Answer: A
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