Sound travels at a speed of about meters, or 1, feet, per second. To calculate your distance from the lightning in meters, just round down to and multiply the number of seconds by To calculate your distance from the lightning in feet, just round 1, up to and multiply the number of seconds by Here's how you do it: Let's say you counted 3 seconds.
Multiply that number by to get your distance in meters. Multiply that number by to get your distance in feet. One lightning strike is about a billion volts and can be between 10, to , amps. Not Helpful 7 Helpful Thunder is caused by the rapid expansion of air due to the extreme heat of lightning and thus creates a sonic boom thunder when it returns to its original state. What is minimum distance that one cannot hear thunder after a lightning flash?
Thunder can be heard from a maximum distance of about 10 miles 16 km under good atmospheric conditions. Not Helpful 12 Helpful If lightning were to strike the water while I was swimming, at what depth would I be safe from being shocked? Do not swim if there is lightning in the sky.
Unfortunately, you can never predict where the lightning will strike next. In fact, lightning doesn't always strike the area right beneath the thundercloud; it can strike as far as 10km away. Not Helpful 15 Helpful Well, sound travels at a speed of about meters, or 1, feet, per second. This means if we times a number of seconds between the flash and the sound and times it by or to be rounded down ,we can get a number of metres that lightning is! Not Helpful 8 Helpful If you hear thunder, it means there is a thunderstorm where you are or nearby, and yes, you could get struck by lightning.
It is best to be inside when there is any sign of a thunderstorm. Not Helpful 16 Helpful Other than a lightning detecting system, there is not a clear way of knowing how far away the lightning is. Not much. Light travels negligibly quicker at higher elevations due to there being fewer particles of air; in contrast, sound travels much more slowly due to less interaction between the particles of air that exist at high elevations.
If a storm is 7. Include your email address to get a message when this question is answered. If there are frightened children around, figure out how far away the strike is and tell them. This will help ease their fears and then they will most likely ask "How did you do that? Helpful 0 Not Helpful 0. Tell people about this method. Many people still believe the myth that the number of seconds you count is equal to the number of miles away the lightning is.
Helpful 1 Not Helpful 0. It can also be used to teach students how to calculate distance, speed and time. Naturally, there is extensive room for error with this method. If possible, calculate the distance of several thunderclaps and average them for improved accuracy. If you have a map and compass, try plotting the location of each lightning strike by drawing a line on the map in the direction of the lightning, and a cross at your calculated distance along this line.
If lightning strikes a point 1 mile away, you will see the strike approximately. If you calculate the difference between these two experiences, a person will hear a strike approximately 4.
Therefore, 5 seconds per mile is a fairly robust approximation. Helpful 0 Not Helpful 1. Sound travels through air at slightly different speeds depending on air temperature and relative humidity.
For more information, see the sound speed calculators in the external links section below. Submit a Tip All tip submissions are carefully reviewed before being published. Lightning might strike you. Helpful 65 Not Helpful What's Happening? What travels more quickly, light or sound? Do you need to review the Storm Safety page? More activities to try: Make Lightning! Make it Rain! Typically, a sharp crack or click will indicate that the lightning channel passed nearby. If the thunder sounds more like a rumble, the lightning was at least several miles away.
The loud boom that you sometimes hear is created by the main lightning channel as it reaches the ground. Since you see lightning immediately and it takes the sound of thunder about 5 seconds to travel a mile, you can calculate the distance between you and the lightning. Keep in mind that you should be in a safe place while counting. Remember, if you can hear thunder, chances are that you're within striking distance of the storm. You don't want to get struck by the next flash of lightning.
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