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In air at a temperature of 70° F (22.2° C), sound travels at a speed of about 1,129 feet (344 meters) per second, which is roughly equivalent to one-fifth of a mile in one second, or one mile in five seconds (or one kilometer in about three seconds).
How far does sound travel every second?
The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 °C (68 °F), the speed of sound in air is about 343 metres per second (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or one kilometre in 2.9 s or one mile in 4.7 s.
How long does it take sound to travel 1 mile?
Thunder travels much slower, at the speed of sound, about 1088 feet per second. It takes sound about 5 seconds to travel one mile.
What is the 30 30 rule for lightning?
Don’t forget the 30-30 rule. After you see lightning, start counting to 30. If you hear thunder before you reach 30, go indoors. Suspend activities for at least 30 minutes after the last clap of thunder.
How far away is lightning per second?
The Correct Method to Calculate Lightning Distance If thunder is heard The lightning is . . . 5 seconds after a flash 1 mile away 10 seconds after a flash 2 miles away 15 seconds after a flash 3 miles away 20 seconds after a flash 4 miles away.
Does sound travel one mile per second?
In air at a temperature of 70° F (22.2° C), sound travels at a speed of about 1,129 feet (344 meters) per second, which is roughly equivalent to one-fifth of a mile in one second, or one mile in five seconds (or one kilometer in about three seconds).
How fast is the speed of lightning in mph?
The speed of lightning While the flashes we see as a result of a lightning strike travel at the speed of light (670,000,000 mph) an actual lightning strike travels at a comparatively gentle 270,000 mph.
How long does it take for sound to travel 3 miles?
The speed of sound changes depending on temperature and humidity but one can estimate that sound travels 1 mile in roughly 5 seconds.
How do you calculate sound distance?
For calculating the distance that sound travels; distance = velocity x time.
At what speed does sound travel?
Sound can travel in air at approximately 332 metres per second. This is fast but not nearly as fast as light which travels at 300 000 kilometres per second.
Is it OK to have your AC on during thunderstorm?
Though it’s tempting to rely on your air conditioner, you shouldn’t run your unit during a thunderstorm. Not only does running your AC during a storm put your system at risk, but it can also put your safety at risk.
How close does lightning have to be to close a pool?
We recommend 30 seconds (6 miles) as a reasonably safe distance when an activity should be stopped and a safe location should have been reached. The typical lightning threat lasts less than an hour.
Is it bad to carry an umbrella in a thunderstorm?
Lightning Odds Using an umbrella in a thunderstorm slightly increases your odds of being struck. If your hair stands on end during a storm, that’s a bad sign. It means positive charge is building up around you and your chances of being struck are extremely high.
Is lightning faster than a bullet?
That is faster than a bullet fired from an assault rifle- 1000 metres per second.
Why thunder is so loud?
Why is thunder so loud? It’s because the amount of electrical energy that flows from the cloud to the ground is so enormous: it’s like a very big waterfall of electricity. The louder the sound that you hear, the closer you are to the lightning. Light travels through air much faster than sound.
Why does thunder make noise?
The temperature of the air in the lightning channel may reach as high as 50,000 degrees Fahrenheit, 5 times hotter than the surface of the sun. Immediately after the flash, the air cools and contracts quickly. This rapid expansion and contraction creates the sound wave that we hear as thunder.
Can sound travel through a vacuum?
Sound waves are travelling vibrations of particles in media such as air, water or metal. So it stands to reason that they cannot travel through empty space, where there are no atoms or molecules to vibrate.
How long does it take for sound to travel 30m?
t = 30 m / 300 m/s = 0.1 sec.
Is lightning hotter than the sun?
In fact, lightning can heat the air it passes through to 50,000 degrees Fahrenheit (5 times hotter than the surface of the sun). When lightning strikes a tree, the heat vaporizes any water in its path possibly causing the tree to explode or a strip of bark to be blown off.
What city has the most lightning strikes?
Top 10 US cities with the highest density of lightning strikes Rank City State 1 Baton Rouge LA 2 Huntsville AL 3 Shreveport LA 4 Boise ID.
How fast is light vs lightning?
Comparing it with the average lightning speed, Light is ~ 675.45 times faster.
What is the speed of sound at 30000 ft?
The speed of sound (Mach 1) varies with altitude and temperature. If an aircraft is travelling at the speed of sound at sea-level then its speed will be 661 knots (760 miles per hour) or if it is travelling at the speed of sound at 30,000 feet then its speed will be 589 knots (677 miles per hour).
How fast do you have to go to break the sound barrier?
U.S. Navy For an airplane to break the sound barrier, it must hit speeds of about 770 mph — when it does that a couple of things happen.
What is the speed Mach 1?
A Mach number is the ratio of an object’s speed in a given medium to the speed of sound in that medium. Mach 1, then, is the speed of sound, around 761 mph at sea level on a standard day.
