1. The Andromenda Galaxy is 2 million light years from the Milky Way. How far away is the Andromeda Galaxy? (ans: 1.89 x 1022 m) Show work 2. A radar pulse is sent out and reflects off an airplane. The echo of the pulse return 14.3 us after it was sent out. How far away is the airplane? (ans: 2.15 km) Show work 3. Infrared light had a lower frequency than visible light. What is the frequency of IR light that has a wavelengh of 680 nm? (ans: 4.41 x 1014 Hz) Show work 4. A car engine's idles at 750 times in 1 minute. What is the frequency of the engine? (ans: 12.5 Hz) Show work

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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.