Waves: Units
Akopọ
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.
Awọn Afojusun
- Use the following units: degree, hertz (Hz), metre (m), metre/second (m/s) and second (s)
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- 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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Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
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
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