Electromagnetic Spectrum Sources And Applications Download What is electromagnetic energy? electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays. the human eye can only detect only a small portion of this spectrum called visible light. a radio detects a different portion of the spectrum, and an x ray machine uses yet another portion. Spectrum is visible light—red, orange, yellow, green, blue, and violet. like expanding ripples in a pond after a pebble has been tossed in, electromagnetic radiation travels across space in the form of waves. these waves travel at the speed of light—300,000 kilo meters per second. their wavelengths, the dis tance from wave crest to wave.
Electromagnetic Spectrum And Their Applications Download Table The characteristics of the various types of electromagnetic waves you will read about below are related to their frequencies and wavelengths. figure 11.5.1: the electromagnetic spectrum, showing the major categories of electromagnetic waves. the range of frequencies and wavelengths is remarkable. the dividing line between some categories is. For this reason, telescopes observing the universe in invisible colours (except part of the radio and infrared) must be placed in space. figure 7 shows the space telescopes operated by esa, and the part of the electromagnetic spectrum they observe. table 1: examples of astronomical sources emitting in each range of the electromagnetic spectrum. Figure 15.5 shows the section of the em spectrum that includes visible light. the frequencies corresponding to these wavelengths are 4.0 × 10 14 s −1 at the red end to 7.9 × 10 14 s −1 at the violet end. this is a very narrow range, considering that the em spectrum spans about 20 orders of magnitude. The electromagnetic spectrum 4. w a v es. • properties of electromagnetic waves include speed, frequency and wavelength. • speed (s), frequency (f) and wavelength (l) are. relat ed in the.
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