The Monroe 2-Orleans Board of Cooperative Educational Services does not discriminate on the basis of age, sex, race, religion, color, national origin, disability, creed, marital status, veteran status, military status, sexual orientation, prior criminal offense, domestic violence victim status, gender identity, gender expression, or genetic status in its services, employment, programs or activities and provides equal access to the Boy Scouts of America and other designated youth groups. You might be interested in her Webpages on lightning.
Sabrina was struck by lightning and was lucky not to get badly hurt. For other information from the National Weather Service about thunderstorms, click here. If you count 10 seconds between the lightning and thunder, the lightning struck 2 miles away.įor further information about lightning and safety, visit the website of the National Lightning Safety Institute. Every 5 seconds between when you see lightning and when you hear the thunder is one mile. You can practice this with a clock to get the timing right if you want. If you say "one thousand one, one thousand two, one thousand three", you have counted about 3 seconds. Use a watch or clock with a second hand or count the seconds. So, if you time how long it takes to hear thunder after you see lightning, you can find out how far away the lightning struck. This is caused by the slower speed of sound. You hear where it was a little while ago. You can see where the plane is right now. Where do you see the plane? Where do you hear the plane? If the jet is flying high, there will be a distance between where the plane can be seen and where it can be heard. Go outside and watch as a jet flies overhead. It takes sound about 5 seconds to travel one mile. Thunder travels much slower, at the speed of sound, about 1088 feet per second. When lightning strikes, a noise is made which we call thunder. This means that you see lightning pretty much when it happens. Lightning travels at the speed of light, about 186,000 miles per second. It is possible to use thunder and lightning to measure how far away a storm is. What day do you first hear thunder? What was the weather like the day before, warmer or colder? What is the weather like after the thunderstorm, warmer or colder? It might be fun to keep track of the first thunder and lightning of the year. Thus an object traveling at Mach 1 is traveling at the speed of sound at Mach 2 it is traveling at twice the speed of sound.With the start of spring typically comes thunderstorms. The speeds of supersonic objects are often expressed in terms of Mach number-the ratio of the object's speed to the speed of sound in the surrounding air. A shock wave is a compression wave that, when produced in air, can usually be heard as a sonic boom. An object traveling at supersonic speed produces shock waves rather than ordinary sound waves. A subsonic speed is below the speed of sound a supersonic speed, above the speed of sound. The terms subsonic and supersonic refer to the speed of an object, such as an airplane, in relation to the speed of sound in the surrounding air. (0 ☌.), the speed of sound in air is 1,087 feet per second (331 m/s) at 68 ☏. In air, for example, the speed of sound increases with an increase in temperature. The speed of sound in a material, particularly in a gas or liquid, varies with temperature because a change in temperature affects the material's density. Sound thus travels faster (about 14 times as fast) in iron than in air. Although the density of air is much less than that of iron, the elasticity of iron is very much greater than that of air. Sound thus travels faster (about 4 times as fast) in hydrogen than in air. Air and hydrogen have nearly the same elastic properties, but the density of hydrogen is less than that of air.
The effect of elasticity and density on the speed of sound can be seen by comparing the speed of sound in air, hydrogen, and iron. The mathematical relationship is speed = (elasticity/density). The greater the elasticity and the lower the density, the faster sound travels in a medium. In general, sound travels faster in liquids than in gases and faster in solids than in liquids. The speed of sound depends on the elasticity and density of the medium through which it is traveling.
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