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10
votes
2answers
103 views

Why does a rolling thunder always starts with a high pitch and ends with a deep, low sound? [duplicate]

Rolling thunders always come cracking in with a high frequency, and the sound grows more deep as the rolling advances, ending with the deep sound of a roaring lion. Why? This is not the same question ...
11
votes
3answers
527 views

Extended sound of thunder

Why does the sound of thunder last several seconds even when lightning lasts for only fraction of a second?
3
votes
1answer
257 views

What causes charge buildup in a cloud before a lightning storm?

I am curious what causes the charge build up in a cloud before lightning occurs. I have seen in a few places such as this, that the process is not fully understood. Is this some form of static ...
1
vote
0answers
37 views

Does wearing a metal hat does increase your chance of being struck by lightning?

Does wearing a metal hat does increase your chance of being struck by lightning? Prompted by this video. My view is that it makes no difference as to the conductivity of the head or the field ...
4
votes
2answers
781 views

Lightning Conductor Working

During a thunderstorm charges collect on clouds until a field which is more than the air's dielectric strength is created. Because now there is a potential difference between the ground (0 Volts) and ...
0
votes
1answer
26 views

Illuminance on the vertical façade from the ground

I am trying to understand the illuminance on a vertical façade from the light reflected from the ground. And am reading this through Daylighting and Architecture book. On page 41 it makes use of two ...
21
votes
4answers
9k views
3
votes
2answers
58 views

Will I get electrocuted holding the container inner surface while lightning strike?

I am building a house made of containers. The container is placed on 1 feet high concrete and no parts touching the ground but the distribution box has a wire to the grounding copper. I read about ...
1
vote
1answer
223 views

Why don't we feel shock when there is lightning? [closed]

When there is lightning in the sky and I am are standing on the ground having no insulating material between me and the ground, why do I not feel an electric shock? If this looks stupid to you I am ...
1
vote
1answer
42 views

Will putting a rubber cap on a steel bar prevent it from getting struck by lightning?

Let's say there's a stainless steel bar pointing to the sky from the ground. Like this there's a possibility it gets struck by lightning. Now would putting a rubber cap on top of the bar change this ...
1
vote
0answers
17 views

What are the “balls” that are present in lightning?

Whenever I see a slow-motion video of lightning, I see that there are some sort of balls going around before the real discharge. My question is.. what are those? (Video for reference: https://vimeo....
0
votes
0answers
30 views

Why is lightning going from the Earth to the clouds while the electrons are going from the clouds to the Earth?

The lightning is often a discharge in advance. The (negative) charge slide occasionally a little further on in the conductive channel, wherein said channel is highlighted each time something. The ...
3
votes
2answers
4k views

Where does the energy of a lightning strike go?

Lightning contains a lot of energy, so where does this energy go after lightning has hit the ground? Does it travel all the way to the core? What happens after that?
1
vote
1answer
15 views

illuminance on a slope plane

I am trying to understand the illuminance from an extended source(sky dome) on an inclined plane. The article I am reading has beautifully explained it. Yet I don't understand the angles and boundary ...
-2
votes
1answer
113 views

What state of matter is thunder? [closed]

I know of solid, liquid and gaseous states of matter but what state of matter is thunder? Is it gas, liquid or solid?
1
vote
1answer
43 views

Is illuminance defined only on a surface normal to the flux?

Assuming on the below image the source is a point source, I can understand that since the light flux falls on dA is the same within the solid angle and since the intensity I = Φ/dω and E = Φ/dA it can ...
1
vote
2answers
38 views

Electric charge difference weapon? [closed]

We all know how lightning works: The clouds have a strong static charge and release that charge towards the ground. But could it be used as a weapon? Would a weapon of the following description work? ...
17
votes
4answers
8k views

Does Fire Conduct Electricity? Why?

Recently, I have stumbled upon a YouTube video by Veritasium describing the conductivity of fire. My question is: how exactly does fire conduct electricity? I am a high school student; therefore ...
10
votes
5answers
30k views

Why should you stay in the car during thunderstorms?

So there appears to be quite a bit of misinformation on the web as to why people should stay in their cars during a thunderstorm. So I'd like to clear some things up. One such non-nonsensical answer ...
4
votes
0answers
54 views

Lightning sprites

Lightning usually occurs due to an electrostatic discharge between an electrically-charged cloud and the Earth's surface, or between clouds. There are also sprites, electrical discharges that occur ...
0
votes
1answer
80 views

Why lightning most likely occure in night?

This is a question based on my experience. I am not going to prove that lightning (succeed by thunder) never occure in day, but it seems it most likely occure in night. May the humidity of air become ...
0
votes
1answer
88 views

Laser-induced electrical discharge

Attracting lightning with an ion beam has been done in a lab but how strong of a laser is needed to reach the clouds to redirect the lightning bolt?
5
votes
5answers
14k views

Can the lightning be captured and used as power source?

I would like to update my knowledge in this area, that is really out-of-dated and stopped somewhere like ten years ago. I asked the very same question on my physics lecture at my studies and got the ...
1
vote
2answers
81 views

Attracting lightning with an ion beam

Can an ion beam be strong enough to create a path for lightning to travel to the ion machine? This is what I found in a lab that may help: An ionization factor jτi (the product of electron beam ...
31
votes
1answer
1k views

Can lightning be used to solve NP-complete problems?

I'm a MS/BS computer science guy who is wondering about why lightning can't (or can?) be used to solve NP complete problems efficiently, but I don't understand the physics behind lightning, so I'm ...
0
votes
1answer
58 views

Atoms Inside a Lightning Bolt

What happens to atoms trapped in lightning? Why do electrons not split an atom but can change them inside the bolt? Can atoms travel on a bolt?
3
votes
1answer
145 views

Electricity from lightning

According to the internet, a lightning strike contains about 5 billion joules or 5 GJ. How was this calculated? Another thing: Once the lightning strike a metal grounded rod, a current will flow. ...
2
votes
0answers
107 views

How does lightning flip a car?

http://www.standard.co.uk/news/london/car-flips-into-air-after-being-struck-by-lightning-in-freak-electrical-storm-accident-10366208.html and a few others (http://news.google.com/news/i/story?ncl=...
2
votes
2answers
619 views

Is it possible to calculate the energy of a spark?

I am not a physicist, but this question came to me and I need to answer it, and I think that you guys can help me. Is it possible to calculate the energy in a spark? For example in a lighter with ...
0
votes
1answer
24 views

Explanation to the flow of charge

I came across a really cool Cymatics video: There is one part in the video which is unclear to me. Please refer to the snapshot below taken at 05:15. I see the equipment being close to a Van de ...
5
votes
1answer
3k views

Does rubber insulate lightning more effectively than air?

Last week, an Ars Technica writer was struck by lightning. He says that the 911 operators were concerned about whether or not he was wearing shoes at the time, but he didn't think it would make much ...
5
votes
1answer
136 views

Does a Tesla coil work in space?

If I took a Tesla coil into space, and then turned it on near, but not touching metal objects- would charge jump to the metal objects? It's my understanding I wouldn't see a flash, since the lightning ...
11
votes
3answers
3k views

Why do lightning rods have a sharp point at the top?

We know that a lightning rod or lightning conductor is a metal rod or metallic object mounted on top of an elevated structure and, if we look closely, most of them have a sharp point at the top. What ...
1
vote
3answers
3k views

Can energy be extracted from clouds?

Can cloud charge imbalance be used as an energy source? First off quite some energy must be present in clouds: a lightning path is quite long, and electrical breakdown of air requires about 1MV/m. ...
0
votes
2answers
3k views

What happens when a lightning rod is not earthed?

A Lightning rod is fixed to the building and it is not given earthing then what happens? How does the lightning reach the ground through the building?
2
votes
2answers
196 views

Is wearing metal armor during lightning safe?

I recently saw in a television show that wearing a metal armor during lightning is good because metal provides the path of least resistance for electricity to flow to the ground. Now my question is,is ...
7
votes
3answers
3k views

Does lightning have mass?

My chemistry teacher/book states that lightning is just light, and therefore has no mass and takes up no space (we're not very far through the book yet, it's defining matter). However, I take issue ...
1
vote
1answer
225 views

What will be effects of harnessing lightning?

In Feynman's Lectures, volume 2, chapter 9, there is a mention of earth getting charged by thunderstorm lightning. It is the thunderstorms throughout the world that are charging the earth with an ...
2
votes
1answer
116 views

Why do nuclear bomb explosions create an array of visible electric discharges in the form of lightening in the upper atmosphere?

I've seen videos on the internet, showing nuclear bomb test explosions, and there appears to be a large amount of visible lightening discharging numerous times over the development of the mushroom ...
0
votes
0answers
26 views

lightning and LTE modem

I have heard that lightning likes to hit to a person who is talking to the cell phone. Is it the same for LTE(4g) modem which is used only for the internet. I mean will my home be more attractive ...
0
votes
3answers
239 views

Lightning Power?

What is the power source of a lightning? It doesn't consume fuel, nor an atomic fission/fusion, but it discharges a large amount of energy. Is it feasible to create an artificial lightning using the ...
2
votes
3answers
1k views

is lightning attracted to pointy objects?

Advice I was given when growing up: in a thunderstorm, stay away from tall, pointy things. It's pretty obvious why lightning would prefer to strike tall objects, but pointy ones? Is there any truth ...
8
votes
2answers
4k views

Tying knots in power cables to prevent power surge from lightning strikes

There are plenty of references to this claim on the internet that tying knots in power cables will prevent a piece of equipment e.g. television or computer from a power surge. How can this be ...
0
votes
1answer
61 views
1
vote
1answer
184 views

Can lightning actually weld fillings in your teeth?

So, I remember sometime in my childhood, someone was teaching me about lightning safety, and they explained that it was important to crouch low but keep as little contact with the ground as possible, ...
13
votes
3answers
373 views

Why does lightning generate multiple branches?

Everyone have seen and knows how lightning occurs. But then I realized that lightning never occurs in straight lines but it follows branching. But Why is that so? Why can't lightning goes in straight ...
1
vote
1answer
200 views

Is it dangerous to use the water tap/bathe/shower during a thunderstorm?

As the title says, is there any danger in touching the water tap or sitting in a bath tub etc. inside the house during a thunderstorm? I heard that it is dangerous, as the lightning could hit some ...
0
votes
2answers
204 views

What will happen when lightning strikes on the surface of the deep sea?

The lightning is having enormous amount of energy, as it strikes the ground it makes various electrical and magnetic effects. If the lightning strikes a tree, that will be burst by lightning. ...
3
votes
2answers
10k views

Why is lightning considered a plasma?

I was wondering why a lightning bolt is coined as "plasma", or a "spark" from an electrical wire/device is as well, yet flares, molten lava, and burning buildings are not(flares are pyrotechnic, ...
0
votes
0answers
98 views

Does lightning have a thickness?

We have calculated (probably measured) the speed, temperature and voltage of lightning so does lightning have a thickness? Note: When a lightning occur it heats up the air rapidly causing the air to ...