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Questions tagged [lightning]

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About lightning and lightning conductor

Lightning not only strikes on a lightning conductor installed on the building... Lightning can strike anywhere on the surface roof of the building even though that building has installed a lightning ...
Nandy's user avatar
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1 answer
60 views

Why are the base of lightning clouds negatively charged?

In elementary explanations of lightning, it's generally stated that the clouds are negatively charged, the Earth is positively charged, and lightning is a discharge between the two. E.g. this source ...
Allure's user avatar
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Should we expect lightning-like phenomena as matter enters the accretion disk of a black hole?

As matter enters the accretion disk it will rapidly turn into superheated plasma. I would expect this to coincide with lightning-like phenomena due to the electric potential difference between this ...
Logan J. Fisher's user avatar
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0 answers
35 views

PBR: Why conductors have tinted specular?

So, as I know when light beam falls on some surface it reflect (specular) and refract (diffuse). Refracted part will interact with material's molecules and it can lose all energy or fly back out of ...
Anaph's user avatar
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Why do the 'colors' of liquids in differently sized glass cylinders appear similar despite varying absorption rates?

For some liquids, such as cooking oil, I have observed that when filling two glass cylinders (with lids) of different diameters (e.g., one with a 5 cm diameter and another with a 10 cm diameter) with ...
user1420303's user avatar
0 votes
1 answer
49 views

Lightning strike pressure on object [closed]

I am doing research on the behavior of lightning strikes and how they affect objects they hit. I have found this article that gives some information about lightning, like speed, length, temperature, ...
AlexanderH22's user avatar
0 votes
1 answer
69 views

Where do the electrons in a lightning bolt come from?

Where do the electrons in a lightning bolt come from? There are problems with the explanations given up to at least two years ago. The explanation that the electrons come from inside the thunder cloud ...
Frank Jansen's user avatar
2 votes
0 answers
38 views

Why does positive cloud-to-ground lightning have no branches?

I have been learning about the physics of lightning lately. Several sources (for example, the book Lightning: Physics and Effects by Vladimir A. Rakov and Martin A. Uman) state that positive cloud-to-...
russell.price's user avatar
0 votes
2 answers
69 views

Can you deduce how far lightning struck from you?

This is just a fun with physics type of question. Seeing that both the speed of sound (In air) and the speed of light are a known constant is it possible to measure the amount of time between you ...
Neil Meyer's user avatar
1 vote
1 answer
161 views

How close to a lightning strike to be perceived at 140dBP, or to risk permanent hearing loss?

I was caught in an electric storm last night while camping. The time between flash and thunder must have been 3 seconds or less at least five times. (The nearest hill peak which could have been ...
novice's user avatar
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0 answers
29 views

How much more voltage is required, theoretically, for a lightning bolt to strike than is actually observed/detected?

Scientists are always saying that they cannot fully explain how lightning works, especially when it comes to the fact that there doesn't seem to be anywhere near enough potential difference between ...
Kurt Hikes's user avatar
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1 answer
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Has anyone experimented with simulating moon lighting?

Has anyone (in general) experimented with simulating moon lighting? It means the following. A gray ball is illuminated with light with a brightness equal to that of the sun. And at the corresponding ...
Vladimir Orlov's user avatar
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1 answer
23 views

Light Transmission Through Half-Hollow Sphere

I am looking for a light source, preferably a laser, for a specific optical experiment. The experiment involves a spherical object positioned 6 meters away from this light source. My goal is to shine ...
rbj's user avatar
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4 votes
3 answers
2k views

How did a spark generate electromagnetic fields that radiate to places?

In the video and pictures below, this guy is trying to replicate Hertz's experiment to generate electromagnetic fields from a dipole antenna. How did a spark generate electromagnetic fields? I thought ...
SnoopyKid's user avatar
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30 votes
4 answers
5k views

How thick in diameter is the average lightning bolt visually?

Note that I’m talking about the visual aspect of a lightning bolt: normal lightning bolts, according to a simple Google search, are only about an inch (3 cm) in diameter, but they appear much bigger ...
Godzilla Louise's user avatar
0 votes
2 answers
91 views

If earth water were pure, would the atmosphere still produce lightning?

Like the title says: If Earth’s water were composed of pure H2O molecules, without anything else dissolved in it, would the atmosphere still produce lightning? I remember that distilled water is not a ...
Alexander Xylona's user avatar
-1 votes
1 answer
28 views

Search for a way to sustain lightning electricity [closed]

Is it possible to sustain lightning electricity through lightning rods?
Neriya Maooda's user avatar
0 votes
1 answer
106 views

Can a pointed lightning rod prevent a lightning strike?

Will a pointed lightning rod disperse the ground charge into the air sufficient enough to prevent the ground charge from building and attracting a lightning bolt?
Jim Phillips's user avatar
2 votes
1 answer
152 views

How are electric sparks produced?

Here's what I have understood so far. (Im talking about electric spark we see in a gas lighter,as shown in the picture) When high voltage is generated at the central metal piece, electrons fly off ...
Rohit Shekhawat's user avatar
0 votes
1 answer
51 views

Electric arc mechanism [closed]

The prominent justification for ground fault interrupter technology is inability of circuit breaker to trip if intermittent low level arcing is generated as a result of the ground fault, so would you ...
DYNAMICS's user avatar
0 votes
1 answer
83 views

In a van de Graaf generator, when a spark happens, is an electromagnetic wave produced? If yes, in which direction?

In a van de Graaf generator, when a spark happens, electrons moves from one globe to the other globe. Is an electromagnetic wave produced? If an electromagnetic wave is produced, why is it produced? ...
Mathieu Krisztian's user avatar
0 votes
1 answer
74 views

What is the physic explanation why does a spark in spark generator doesn't jump in a straight way? [duplicate]

Picture source: This is the spark in a spark gap transmitter, a transmitter in the early of radio is discovered, or maybe including the Hertz's experiment itself. This is also we may see in a spark ...
AirCraft Lover's user avatar
1 vote
1 answer
721 views

Simulated nuclear blast using electric arcs

"Nuclear bombs" have some distinct associated phenomena. They produce loud bangs. They produce bright flashes of light. They produce bursts of gamma radiation. These phenomena are diagnostic ...
fertilizerspike's user avatar
1 vote
1 answer
171 views

Why is the lightning waveform modelled by double exponential waveform?

As per wiki: The electric current within a typical negative CG lightning discharge rises very quickly to its peak value in 1–10 microseconds, then decays more slowly over 50–200 microseconds. Why ...
Dynamic_equilibrium's user avatar
1 vote
1 answer
176 views

What is the maximum voltage gradient between two electrodes? [closed]

What is the maximum voltage gradient between two electrodes? It would be great if you put the reference to your answer. UPDATE Our environment is vacuum.
mohammad rezza's user avatar
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1 answer
47 views

Does any colour appear white to our eyes if its emitted power is extremely large?

let's consider an ideal monocromatic source (for instance red) and let's assume you can regulate its emitted power without compromising its spectral "finesse". Start from 0 emitted W/sr. It ...
Kinka-Byo's user avatar
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2 votes
0 answers
40 views

Does the power state of an electrical device affect its likelihood of being struck by lightning?

Holidaying in the tropics, I have come across the following behaviors which are all intended to reduce the likelihood of attracting a lightning strike when in a storm. Turning off the CD player/radio ...
Magic Thighs's user avatar
-1 votes
2 answers
72 views

Reasoning why the lightning shocks doesnt cause any shocks to a person inside car if the conditon is not fully electrostatic

I am just confirming here how the concept of electrostatic shielding helps in preventing lightining to be not getting into the car inside . So we know car has a metal body outside , so first consider ...
Paracetamol's user avatar
2 votes
1 answer
55 views

Is upper-atmospheric lightning loud?

The upper layer of the atmosphere has much less density, and pressure. Do phenomena like blue jets, or gnomes even make a sound?
Tuesday's user avatar
  • 31
4 votes
0 answers
191 views

What happens to the positive charges in the cloud after a lightning discharge?

The clouds before a lightning strike contains ice crystal at upper part of the cloud that is positively charged and lower part of the cloud becomes negatively charged. When enough electrons ...
A 10th grader's user avatar
0 votes
1 answer
133 views

Is this argument about sharp and blunt lightning rod right? [duplicate]

Actually I came to know that sharp lightning rods are not sensitive to the weak electric field comparing to blunt lightning rods. Resistance will resist the formation of field on the rod. So, we know ...
Sanjay's user avatar
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0 votes
3 answers
104 views

What causes the behavior of this lightning flash?

I saw a "strange" behavior in the recording made by an ultrafast video camera. We can see a lightning flash growing dim, the growing bright a few times before it's gone. How can this happen? ...
MatterGauge's user avatar
7 votes
5 answers
4k views

If lightning is caused by ionisation of air, why does it only last briefly?

I'm comparing lightning and fire - both are related to ionisation of air but lightning happens so fast in a blink of an eye while fire goes on until it runs out of fuel. My question is: despite being ...
user6760's user avatar
  • 13k
24 votes
8 answers
4k views

Does a tower bell ringing prevent thunderstorms?

Introduction This is the beginning of an apparently physics-unrelated question which involves 1700-1800 Italian law, atmospheric processes, sound waves propagating through fluids, and lightning ...
Fanale's user avatar
  • 359
0 votes
1 answer
940 views

Dielectric breakdown voltage of air vs electric field during a thunderstorm

The dielectric strength of air (ie. the maximum electric field that the material can withstand under ideal conditions without undergoing electrical breakdown and becoming electrically conductive) is 3 ...
Oumani Papa's user avatar
1 vote
1 answer
888 views

Danger to swimmer from lightning?

Having been swimming a few times recently when a thunderstorm developed, I've started wondering what the actual dangers are (please note - I'm more interested in this from a science perspective; I get ...
askvictor's user avatar
  • 131
1 vote
0 answers
36 views

Effect of one lightning on its consecutive lightning

When lightning strikes several times in one area, I wonder if the first lightning strike affects the next lightning. For example, when lightning strikes a point $A$, does the next lightning have a ...
one potato two potato's user avatar
1 vote
1 answer
83 views

Why does lightning strike objects on the ground or the ground itself?

From my keen observation the water vapor in the cloud turns into ice particulate and bumps into each other so there is region with more electrons than the rest of the cloud, but lightning should form ...
user6760's user avatar
  • 13k
1 vote
1 answer
65 views

Mechanism of structure of atmospheric lightning

Lightning is a natural atmospheric phenomenon.From early childhood years we all are familiar with the concept of lightning.But recently,from a website named Z T RESEARCH,i came across the fact that ...
Sohini Roy's user avatar
1 vote
2 answers
4k views

What makes the speed of lightning different to the speed of light?

The difference between light and lightning, their different speeds and a reason why the speeds differ
Charles Roberts's user avatar
0 votes
1 answer
62 views

How observable is the "macroscopic" dark matter candidate?

I was recently introduced to the dark matter candidate known as "macros," which are theoretically made up of macroscopic clumps of matter rather than of an elementary particle. These ...
Daddy Kropotkin's user avatar
0 votes
2 answers
2k views

How does the Extreme Heat of a Lightning Bolt not Kill Anyone?

Ok so, according to various different online sources, a single bolt of lightning is capable of raising the temperature of the air it rips through to... ummmmm... 50,000 degrees Fahrenheit? What? That'...
Crystal King's user avatar
0 votes
1 answer
119 views

Energy of each electron in a lightning bolt

I have read that lightning bolts have a difference of potential of 300 Mega Volts. Does it mean that the electrons in the cloud have an energy of 300MeV each? I found that astonishing since that ...
Sergio Prats's user avatar
-1 votes
3 answers
1k views

If the earth is negatively charged why is lightning striking it?

So, as far as I know, the Earth is negatively charged, and there are such things as lightning strikes which travel from clouds to the Earth- that would mean the clouds in a thunderstorm are positively ...
Tessaract's user avatar
  • 109
1 vote
1 answer
58 views

Would electricity be able to make a gamma ray?

I read that lightning creates gamma rays, but i'm not sure if it would be possible to have a capacitor that powerful to make a gamma ray. If this is possible, how efficient would such a process be?
Tyler's user avatar
  • 23
7 votes
1 answer
550 views

Why doesn't lightning stop when it starts raining?

According to my understanding, lightning happens because the clouds get charged due to friction from the moving clouds and the ground gets polarized by the nearby charged clouds. And the two opposite ...
Vignesh Sk's user avatar
0 votes
1 answer
48 views

Lightning's tendency to find a tall point on the ground

Is lightning's tendency to connect to a high point on the ground due to probability in the colloquial sense, or is there some sort of electromagnetic stream of "information" exchanged ...
Sketcher's user avatar
  • 113
0 votes
1 answer
70 views

Does electric current still remain a scalar quantity even while talking about electric arcs/ discharge?

Current is said to be a scalar quantity because it's direction is determined by the direction of the wire/conductor. But in certain cases electrical currents flow through some materials which are ...
pyramiskyma's user avatar
4 votes
0 answers
125 views

Why do lightnings generated by a tesla coil also move upwards?

I was recently watching some videos of Tesla coils, and the behavior of the rays caught my attention. In the picture below, you can see how the coil is emitting lightnings, some of them towards the ...
Rafael Rodríguez Velasco's user avatar
0 votes
2 answers
200 views

Is there a small spark every time a switch is closed to engage a circuit?

Suppose we have a simple circuit with a resistor $R$ connected to a DC voltage source $V_{\text{batt}}$. The circuit can be enabled or disabled by a switch. The dielectric breakdown of air is $E_{\...
Jagerber48's user avatar
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