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Name Wave speed WS date The speed v of a wave is given by one of two equations: v = d/t and v =f2. d stands for distance, t for time, ffor frequency and a for wavelength. To help you solve for v, d, or t use: To help you solve for v, for 2, use: Which one of these equations: v =d /t or v =f2, would you use if you were given the wavelength of the wave and its frequency? Which one of these two equations would you use if you were given the distance that the wave traveled in a certain amount of time? 1. A seismic (earthquake) wave travels 4500 meters in 0.51 seconds. What is the speed of the seismic wave? 2. A water wave has a frequency of 0.75 Hz and a wavelength of 1.50 m. What is its speed? 3. Approximately how long does it take sunlight to reach us from the Sun? Hint: The Earth-Sun distance and the speed of light in a vacuum are found in the Reference Tables. 4. a/ How much faster is light in a vacuum than sound in air? To do this, find the ratio of the "speed of light in a vacuum" to the "speed of sound in air." Both speeds are in your Reference Tables. (Hint: Ratio means divide the first by the second.) b/ Imagine that lightning strikes a tree that is a distance of 1610 m away. How much time will it take the light wave to reach you? (The speed of light in air is about the same as it is in a vacuum.) c/ When lightning strikes, it makes a sound called thunder. How much time will it take the thunder sound wave to reach you from the tree in the above example? d/ Round your last answer to 1 significant figure. The distance 1610 m equals one mile. About how long does it take sound to travel 1 mile in air? If lightning strikes and you count 10 seconds until you hear thunder, how far away (in miles) was the strike? If lightning strikes and you count 3 seconds? What if you count 8 seconds