WebbFor most computers and TVs, there are red, blue, and two green LEDs in pixels, but some fancy screens also have yellow. There are two greens because our eyes are most sensitive to green, around 550 nm wavelength. When you want white light, all of the LEDs light up; when you want black, all are dim. Webb17 feb. 2024 · Case Study Based Questions Answers. 1. (i) A wave of frequency 2×10 18 belong to X-rays of electromagnetic spectrum. (ii) The range of wavelength for X-rays is around 1 nm to 10 -3 nm. (iii) X-rays are produced due to change in speed of fast moving electrons, when they collide and interact with the target anode.
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WebbEM waves don’t need a medium in which to propagate; they can travel through a vacuum, such as outer space. A radio works because sound waves played by the D.J. at the radio station are converted into electromagnetic waves, then encoded and transmitted in the radio-frequency range. WebbVisible Light. Visible light is defined as the range of wavelengths which are visible to humans; Visible light is the only part of the spectrum detectable by the human eye. However, it only takes up 0.0035% of the whole electromagnetic spectrum; In the natural world, many animals, such as birds, bees and certain fish, are able to perceive beyond … thomas myrter do st johnsbury
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Webb4 aug. 2016 · We are required to find the relative velocity of the galaxy to the earth given is the frequency of the signal emitted by the source in the distant galaxy while observed on earth. It is a question of application of Doppler effect … WebbPhysics Galaxy, world’s largest website for free online physics lectures, physics courses, class 12th physics and JEE physics video lectures. Video Lectures on Physics for the … WebbThe swell of a wave in the ocean, and the subsequent dip that follows, is simply a vibration or oscillation of the water at the ocean’s surface. Electromagnetic waves are similar, but they are also distinct in that they … uhrs notification