Waves: Units
Gbogbo ọrọ náà
Waves carry energy from place to place, whether they are ripples on a pond, sound vibrations in the air, or light crossing the vacuum of space. Describing them precisely requires five units that connect frequency, wavelength, speed, time period, and angle.
This reference covers the units the Edexcel specification lists for the Waves section: hertz, metre, metre per second, second, and degree. You will see how each unit fits into the wave equation and practise switching between them.
Ebumnobi
- Use the following units: degree, hertz (Hz), metre (m), metre/second (m/s) and second (s)
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Ekele diri gi maka imecha ihe karịrị na Waves: Units. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- What is the SI unit of frequency? A) m/s B) Hz C) s D) m Answer: B
- A wave has a period of 0.01 s. What is its frequency? A) 0.01 Hz B) 10 Hz C) 100 Hz D) 1000 Hz Answer: C
- Angles of incidence and refraction are measured in: A) radians B) hertz C) metres D) degrees Answer: D
- Which equation correctly links wave speed, frequency and wavelength? A) v = f / lambda B) v = f x lambda C) v = lambda / f D) v = f + lambda Answer: B
- One hertz is equivalent to: A) one metre per second B) one cycle per second C) one second per cycle D) one degree per second Answer: B
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Period and Frequency in Oscillations
When you pluck a guitar string, the resulting sound has a steady tone and lasts a long time. Each successive vibration of the string takes the same time as the previous one. We define periodic motion to be a motion that repeats itself at regular time intervals, such as exhibited by the guitar string
"College Physics: Period and Frequency in Oscillations" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/16-2-period-and-frequency-in-oscillations. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
Ndị otu ndị ọzọ bipụtara ha n'okpuru ikike mepere emepe, anyị na-ekele ha dị ka ha si chọọ. Njikọ na-emepe saịtị ha.
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