(3 × 10^8 m / s) / (7.5 × 10^14 Hz)
could someone solve this with clear steps
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Answers
Answer:
Electromagnetic radiation is the name given to a whole range of transverse radiation having differing wavelengths but six common properties, namely:
(a) it is propagated by varying electric and magnetic fields oscillating at right angles to each other;
(b) it travels with a constant velocity of 299 792 458 ms-1 in a vacuum;
(c) it is unaffected by electric and magnetic fields;
(d) it travels in straight lines in a vacuum;
(e) it may be polarised;
(f) it can show interference and diffraction.
The oscillating fields are represented by Figure 1.
For a light beam with an intensity of 100 A Wm2 the amplitude of the electric vector can be shown to be 200 VM-1 and that of the magnetic vector 10-6 T. In optics the electric vector is the more important, partly because of the ability of electric fields to affect static charges.
Regions of the electromagnetic spectrum
For convenience the electromagnetic spectrum is divided into the following regions:
Gamma-rays
[wavelength 10-14 m -10-11 m, frequency 1022 Hz – 1019 Hz,
mean energy per quantum 6.6x10-14 J = 4x105 Evening = 7.5x10-31 kg]
X-rays
[wavelength 10-12 m -10-8 m, frequency 1020 Hz –1016 Hz,
mean energy per quantum 6.6x10-17 J = 4x102 el = 7.5x10-34 kg]
Ultraviolet radiation
[wavelength 10-8 m -10-6 m, frequency 1017 Hz –1015 Hz,
mean energy per quantum 6.6x10-20 J = 4x10-1 Evening = 7.5x10-37 kg]
Visible light
[wavelength 10-7 m -10-6 m, frequency 1015 Hz – 1014 Hz,
mean energy per quantum 6.6x10-19 J = 4x10-2 Evening = 7.5x10-38 kg]
Infrared radiation
[wavelength 10-6 m -10-3 m, frequency 1014 Hz – 1012 Hz,
mean energy per quantum 6.6x10-21 J = 4x10-4 Every = 7.5x10-40 kg]
Microwaves
[wavelength 10-4 m – 10-1 m, frequency 1013 Hz – 109 Hz,
mean energy per quantum 6.6x10-23 J = 4x10-6 Event = 7.5x10-42 kg]
Radio waves
[wavelength 10 m – 103 m, frequency 108 Hz – 106 Hz,
"mean energy" per quantum 6.6x10-26 J = 4x10-9 Every = 7.5x10-45 kg]
Many of these regions overlap, the distinction between one region and another lying in the way in which the radiations are produced. The range of wavelength, frequency and energy per quantum are also shown: the scales for both frequency and wavelength are logarithmic. There follows a summary of the production, properties and detection of the different regions of the electromagnetic spectrum.
Gamma-radiation
This radiation is normally produced by transitions within the excited nucleus of an atom and usually occurs as the result of some previous radioactive emission.
Gamma- radiation can result from fission or fusion reactions or the destruction of a particle-antiparti let pair, such as an electron and a positron. It is used in some medical treatment and also for checking flaws in metal castings, and it may be detected by photographic plates or radiation detectors such as the Geiger tube or scintillation counter.
Explanation:
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