When light passes from one medium to another, its frequency remains the same but its wavelength changes. Light travels from vacuum to water. The speed of light in vacuum is 1.33 times its speed in water. Compare the wavelength of light in a vacuum to that in water. Compare also its energy in the two media. (ms waves problem solving)

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Q: 19 In the diagram below, P is a source of radio waves of frequency 75 MHz. The waves travel to R by…

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.