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level: Electromagnetic Spectrum

Questions and Answers List

level questions: Electromagnetic Spectrum

QuestionAnswer
what does the electromagnetic spectrum consist ofa group of radiations that all travel at the speed of light
what is the order of radiations in the electromagnetic spectrumradio microwave infrared visible ultraviolet x rays gamma rays
what is the relative frequency and wavelength of radio waves10^3m wavelength 10^4Hz frequency
what is the relative frequency and wavelength of micro waves10⁻²m wavelength 10⁸Hz frequency
what is the relative frequency and wavelength of infrared radiation10⁻⁵m wavelength 10¹²Hz frequency
what is the relative frequency and wavelength of visible light0.5x10⁻⁶m wavelength 10¹⁵Hz frequency
what is the relative frequency and wavelength of ultraviolet radiation10⁻⁸m wavelength 10¹⁶Hz frequency
what is the relative frequency and wavelength of x-rays10⁻¹⁰m wavelength 10¹⁸Hz frequency
what is the relative frequency and wavelength of gamma rays10⁻¹²m wavelength 10²⁰Hz frequency
can electromagnetic waves travel through a vacuumyes
name sources, detectors, uses and dangers of radio wavessource: electronic circuits detector: aerial uses: communication, radio, TV dangers: safe unless very concentrated
name sources, detectors uses and dangers of microwavessource: electronic circuits detector: aerial uses: communications, satellites, heating water & food dangers: burning if concentrated
name sources, detectors, uses and dangers of infrared radiationinfrared waves are emitted from hot or warm objects, they are heat waves source: electronic devices, sun, warm objects detector: electronic detector, heat sensitive papers, black bulb thermometer uses: detector in security lighting, remote controls danger: burning if concentrated
how does surface colour and texture affect infrared radiation emission and absorptiondark, matt surfaces are good absorbers and emitters of infrared radiation. They are good at trapping heat energy. light coloured, shiny surfaces are poor absorbers and emitters of infrared radiation (they are good reflectors). They are not good at trapping heat energy, and rather keeping objects cooler.
name sources, detectors, uses and dangers of visible lightsource: electronic devices detector: eye, photographic film, electronic components uses: seeing, photography, communication, laser surgery dangers: burning , blindness if concentrated
name sources, detectors, uses and dangers of ultraviolet lightsource: sun, gas discharge, lamps detector: causes fluorescence in some objects, film uses: sun tan lamps, making ions, making vitamin D, killing bacteria in water treatment plants dangers: sun burn, skin cancer, retinal damage
name sources, detectors, uses and dangers of x rayssource: very fast electrons hitting a metal target detector: photographic film uses: imaging breaks/defects in bones, hidden devices dangers: cell destruction, cell mutation, cancer
name sources, detectors, uses and dangers of gamma rayssource: radioactive nuclei decaying detector: photographic film, gm tube uses: medical tracers, killing cancerous cells, sterilisation of surgical equipment dangers: cell destruction, cell mutation, cancer
what is the relationship between energy and frequency of waveswaves with higher frequency have greater energy than lower frequency waves