Electromagnetic Spectrum
Gbogbo ọrọ náà
Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays look like seven different things, but they are one family: the electromagnetic spectrum. They differ only in frequency and wavelength, and they all race through space at the same enormous speed.
In this lesson you will put the regions in order, learn the everyday uses of each, understand the harm that too much of each can do, and use the fact that all electromagnetic waves travel at \(3.0 \times 10^{8}\,\text{m/s}\) in a vacuum. This is one of the most fact-rich and frequently tested topics in the course.
Ebumnobi
- Know the main regions of the electromagnetic spectrum in order of frequency and in order of wavelength
- Know that all electromagnetic waves travel at the same high speed in a vacuum
- Describe typical uses of the different regions of the electromagnetic spectrum including: (a) radio waves; radio and television transmissions, astronomy, radio frequency identification (RFID) (b) m icrowaves; satellite television, mobile phones (cell phones), microwave ovens (c) infrared; electric grills, short range communications such as remote controllers for televisions, intruder alarms, thermal imaging, optical fibres (d) visible light; vision, photography, illumination (e) ultraviolet; security marking, detecting fake bank notes, sterilising water (f) X-rays; medical scanning, security scanners (g) gamma rays; sterilising food and medical equipment, detection of cancer and its treatment
- Describe the harmful effects on people of excessive exposure to electromagnetic radiation, including: (a) microwaves; internal heating of body cells (b) infrared; skin burns (c) ultraviolet; damage to surface cells and eyes, leading to skin cancer and eye conditions (d) X-rays and gamma rays; mutation or damage to cells in the body
- [Supplement] Know that the speed of electromagnetic waves in a vacuum is 3.0 × 108 m / s and is approximately the same in air
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Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
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Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Electromagnetic Spectrum. 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.
- Which region has the highest frequency? A. radio waves B. infrared C. visible light D. gamma rays Answer: D
- The speed of all electromagnetic waves in a vacuum is about: A. 330 m/s B. 1500 m/s C. 3.0 x 10^8 m/s D. 3.0 x 10^6 m/s Answer: C
- Which region is used in television remote controls? A. ultraviolet B. infrared C. X-rays D. gamma rays Answer: B
- Excessive ultraviolet radiation can cause: A. skin cancer and eye damage B. only skin burns C. internal heating of cells D. no harm Answer: A
- An EM wave of frequency 1.0 x 10^9 Hz has a wavelength in a vacuum of: A. 0.30 m B. 3.0 m C. 3.0 x 10^17 m D. 0.030 m Answer: A
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Mụtakwuo ihe site na isi mmalite mepere emepe
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Akụkụ akwụkwọ
The Electromagnetic Spectrum
Define the electromagnetic spectrum, and describe it in terms of frequencies and wavelengths
"Physics: The Electromagnetic Spectrum" 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/15-1-the-electromagnetic-spectrum. Access for free at https://openstax.org/books/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.
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Electromagnetic Spectrum? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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