Physics: Waves: Units
Muhtasari
A wave is described by only a handful of numbers: how long it is, how often it repeats, how fast it moves and what angle it strikes a surface at. Each of those numbers is useless without the unit that goes with it, and the Waves section leans on just five of them.
This lesson sets out the degree, the hertz, the metre, the metre per second and the second: what each one measures, which are built from the others, how to move between prefixes such as MHz and nm, and how a quick unit check can catch a wrong answer before the examiner does.
Malengo
- Use the following units: degree, hertz (Hz), metre (m), metre/second (m/s) and second (s)
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- The unit of frequency is the: A) metre B) second C) hertz D) degree Answer: C
- A wave has a period of 0.5 s. Its frequency is: A) 0.5 Hz B) 2 Hz C) 5 Hz D) 50 Hz Answer: B
- Which quantity is measured in metres? A) Frequency B) Period C) Wavelength D) Wave speed Answer: C
- 2.5 MHz written in hertz is: A) 2500 Hz B) 250000 Hz C) 2500000 Hz D) 25000000 Hz Answer: C
- Angles of incidence and reflection are measured in degrees from the: A) surface B) normal C) reflected ray D) horizontal Answer: B
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Vitabu Vinavyopendekezwa
Jifunze zaidi kutoka vyanzo huria
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Sehemu ya kitabu
The Language of Physics: Physical Quantities and Units
Associate physical quantities with their International System of Units (SI)and perform conversions among SI units using scientific notation
"Physics: The Language of Physics: Physical Quantities and Units" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/1-3-the-language-of-physics-physical-quantities-and-units. Access for free at https://openstax.org/books/physics/pages/1-introduction
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