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Sunlight is a form of electromagnetic energy?
Sunlight contains a wide range of the electromagnetic spectrum. Newton found that by using a prism to spread the spectrum of the sun across a wall He could observe the colors of light and with a thermometer even detect infrared light where there was no visible light at the red end of the colors. /\ | | That wasn't the question?
Theoretically What is the maximum possible luminous efficacy?
683 lm/w for a pure monochromatic green light source at a single wavelength of 555 nm. This is because a lumen (lm) is measured according to sensitivity of the human eye and the eye is most sensitive at 555 nm. For a wide-spectrum "white" light source, the theoretical maximum is about 280 lm/W if the luminous energy is evenly spread across the visible spectrum. The number can vary slightly depending on the limits chosen for the visible spectrum and how white light is defined.
What are the advantages and disadvantages for people use to carry handkerchief before facial tissues came along?
The advantages of people carrying handkerchief before the facial tissues came along is that it helped them be hygienic. The disadvantage is at times it lead to the spread of some airborne diseases.
What s the meaning of spectrum?
An apparition; a specter., The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed or studied either as spread out on a screen, by direct vision, by photography, or otherwise. See Illust. of Light, and Spectroscope., A luminous appearance, or an image seen after the eye has been exposed to an intense light or a strongly illuminated object. When the object is colored, the image appears of the complementary color, as a green image seen after viewing a red wafer lying on white paper. Called also ocular spectrum.
What color of light has the longest wavelength and the shortest?
The color RED has the longest wavelenth, and the color VIOLET has the shortest wavelenth. ---- Also Wavelenth is inversely propotional to frequency, so we can also say that color VIOLET has longest frequency and color RED has the shortest. VIBGYOR V-Violet (Highest Frequency, Shortest Wavelenth) I-Indigo B-Blue G-Green Y-Yellow O-Orange R-Red (Highest Wavelenth,Shortest Frequency)
What is The use of multiple frequencies to transmit a signal?
spread-spectrum technology
What has the author James Alfred Cocci written?
James Alfred Cocci has written: 'A spread spectrum communication technique'
Which type of spread spectrum is mostly preferred?
which type of spread spectrum is advantageous? which type of spread spectrum is advantageous?
What is the effect of varying frequency of the carrier signal on the AM wave?
spread spectrum , modulation or depending on the bandwidth poss FM (deviation)
Which of the following are criteria that define a transmission method as a spread spectrum technique?
The transmitting signal bandwidth is much wider than would normally be necessary to transmit the information Some influence other than the information being transmitted is used to determine the transmitting bandwidth
What is the relation between the bandwidth of a signal and after it has been encoded using spread spectrum?
there is no basic difference btw the BW. it is the same before & after the SS encoding
What are the advantages of using a spread spectrum radio system?
The spread spectrum technique is supposed to be less susceptible to natural noise, co-channel RF interference, intentional jamming, and unauthorized eavesdropping. It should also be less susceptible to degradation due to multipath fading, which is highly frequency-selective.
What is the relation between the bandwidth of a signal before and after it has been encoded using spread spectrum?
there is no basic difference btw the BW. it is the same before & after the SS encoding
What are the CDMA bands?
CDMA-(code division multiple access), uses spread spectrum technique, which spreads the bandwidth of the data uniformly for the same transmitted power.(surce:wikipedia)
Difference between Frequency hopping spread spectrum and direct sequence spread spectrum?
Spelling difference.... :)
What is a spread of colors?
A spectrum.
What is jamming margin?
It is the maximum jammer power to signal power ratio that a spread spectrum receiver can tolerate, while still maintaining the specified bit-error-rate.
