We hear thunder before it rains, why can t we see its shape?

In the southern region, there is a lot of rainfall in summer, especially in weather such as thundershowers, which are more common. It happened to be the season of harvesting and drying rice in the southern region, so farmers jokingly called it "robbery", that is, to rush to harvest their own dried rice before the heavy rain. In heavy rain, thunder and lightning are prone to occur.

We hear thunder before it rains, why can't we see its shape? There are two main reasons:One is that light travels in a straight line in the same medium, while sound can travel in multiple directions; The second is that lightning has limited brightness and limited travel distance.

The first point is that light travels in a straight line in the same transparent, homogeneous medium, and lightning is a type of light, but lightning is in the air, and in addition to light, we also have clouds, that is, a mass formed by the evaporation of water vapor. This is also evidenced by the fact that the lightning we usually see is in the shape of "vertical and horizontal". Although the propagation of light does not require the use of media, if there are more media, it will block the further propagation of light.

Although light travels fast in a vacuum, we know that there is oxygen, carbon dioxide, and nitrogen on the earth, and there is no way to achieve a vacuum. Sound can be further disseminated with the help of other media. <>

The second point is because lightning has a limited brightness and a limited distance to travel. When it rains and thunders, we see less lightning because the lightning itself is not bright enough. The light source is not bright enough, which greatly affects whether the lightning can appear in front of people.

The earth is like a huge transparent shroud, in which sound can travel very quickly, plus the human body is very sensitive to sound. So on rainy days we hear thunder, but we can't see its shape. <>

When thunder, especially accompanied by lightning, we must pay attention to protection if we are outdoors. Do not stand under trees or under high-voltage power lines, choose a low-lying place to take shelter from the rain. If we are at home, we should disconnect the wiring and unplug the power supply, so as not to let the television, computer, etc. lead to lightning into the room, damage the electrical appliances and cause fire accidents.

Lightning is the phenomenon of the accumulation of electric charges in the clouds and the discharge of electricity, while thunder is the sound produced by the sudden and violent heating of the air in the lightning path inside the clouds, thus causing the air to expand sharply, and the internal release of the electric charge cannot form visible lightning.

Thunder and lightning appear together, but because light travels much faster than sound, we see lightning first and then hear thunder, if it is daytime, we may not see lightning but only hear thunder after comparing the clouds in the sky.

Because sound travels faster than lightning shows. The propagation of thunder quickly enters the human ear through the propagation of sound, but lightning is different, you need to know the direction first, and then observe it with the naked eye.

Because many times, thunder and lightning are behind thick black clouds that we can't see, or are far away from us.

Seconds after the lightning strikes, the shock wave evolves into a sound wave, which is what we hear as thunder.

Along with the lightning came the rumbling of thunder. As it sounds, thunder can be divided into many kinds. The thunder that is as fast and powerful as ** is called "explosive thunder"; There is also a kind of thunder that lasts for a long time, a bit like the sound made when grinding, called "pulling thunder".

The so-called explosion of thunder is generally the sound made by the clouds at the moment of ionization of the ground. In this case, the observer hears thunder almost immediately after seeing the lightning; Sometimes thunder is heard at the same time as the lightning. Because of its high energy, the ** wave it produces is very fast, so it sounds like **.

How thunder is formed, come in and tell you.

Seeing lightning first and then hearing thunder is because lightning travels fast in the atmosphere.

Lightning and thunder occur at the same time, but the speed at which they travel through the atmosphere varies greatly, so people always see lightning before they hear thunder. Light can travel about 300,000 kilometers per second, while sound can only travel 340 meters.

According to this phenomenon, the distance from the time when the lightning is seen to the time when the thunder is heard can be calculated from the length of the time the lightning occurs. If the lightning is in the northwest and thunder is heard every 10 seconds, it means that the thunderstorm is about 3,400 meters away.

Hello. The main reason why lightning is seen first and then thunder is heard. Light travels fast.

It travels about 300,000 kilometers per second. Sound travels a bit slower than light. Approximately 340 meters per second.

So we will see lightning first, and after a while we will hear thunder.

Because light travels faster than sound, lightning is seen first and thunder is heard when thunder is struck.

This is a natural phenomenon. Because dark clouds have positive and negative poles, when two clouds collide together, lightning will appear first, and then thunder will appear.

Of course, this is a natural phenomenon, because dark clouds have positive and negative poles, and when two clouds collide together, there will be lightning and thunder first.

In thunderclouds, lightning and thunder occur at the same time, and the reason why people always see lightning first and hear thunder later is because light travels much faster than sound.

Light travels almost 300,000 kilometers per second in the air, and at such a speed, it can travel seven and a half times around the Earth's equator in one second. Sound travels about 340 meters per second in the air, almost 1/900,000 of the speed of light.

The time it takes for light to travel from the place where the lightning occurs to the ground is usually only a few hundredths of a second, but it takes a long time for the sound to travel the same distance.

Thunder is caused by the friction of positive and negative charges between clouds and clouds in the atmosphere to produce violent discharge, produce high temperatures, make the atmosphere expand sharply, and produce a deafening loud sound, which is lightning and thunder.

When atmospheric charges are constantly accumulating in the clouds. If the amount of charge becomes strong enough, lightning will occur. When lightning crosses the sky, it can quickly warm up the air along its path.

The heated air swelled rapidly, and the clumps slammed into all directions as violently as if they were happening. This causes a huge sound wave. Ode to the Shed.

Lightning and thunder occur at the same time, and according to the propagation velocity table, the propagation speed of sound is 340 meters and seconds, and the propagation speed of light is 3 108

meter seconds, then the speed of light in the air is greater than the speed of sound, the light and sound travel the same distance to the observer, and the time required for lightning is very short, causing us to see lightning first and then hear thunder