Nova Zhang
Lightning is a natural phenomenon that has long fascinated humans, often leaving them wondering about its speed and power. It is common knowledge that light travels faster than sound, but does lightning, a bright natural electrical discharge, follow the same rules? When lightning strikes, the speed at which it travels is a crucial factor in understanding its impact. So, does lightning travel faster than the speed of sound, or is it the other way around?
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What You'll Learn
Lightning is electron plasma moving through charged air, not light
It is a common misconception that lightning is light. In reality, lightning is a result of electron plasma moving through charged air.
As a thundercloud moves over the Earth's surface, an equal electric charge, but of opposite polarity, is induced on the Earth's surface. The induced positive surface charge increases as the center of the storm arrives and drops as the thundercloud passes. This creates an electric field within the air between the two oppositely charged regions, with the strength of the electric field depending on the strength of the surface charge on the base of the thundercloud.
The charge carrier in lightning is mainly electrons in a plasma. Plasma is created when electrons are "freed" from their host atoms for a short time due to high temperatures. When a column of electrons flows from the sky to the ground, the air that it passes through lights up with energy. What we perceive as lightning is actually the air through which the electrons pass, getting excited and giving off light.
The electrostatic discharge of lightning is faster than sound. Lightning travels at around 224,000 mph, which is nowhere near the speed of light. The return stroke, which is the most luminous and noticeable part of the lightning discharge, occurs when electrons accelerate rapidly in a zone beginning at the point of attachment, expanding across the entire leader network at up to one-third of the speed of light.
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The speed of sound is 331.3–343.2 m/s or 1,087 ft/s
The speed of sound is variable and depends on factors such as temperature and humidity. At 20°C, the speed of sound is approximately 343.2 meters per second or 1,087 feet per second. At 0°C, the speed of sound is slightly slower at 331.3 meters per second, which is equivalent to 1,087 feet per second.
When lightning strikes during a thunderstorm, it is the tremendously fast visible light that you see first. The speed of light is approximately 186,282 miles per second, which is much faster than the speed of sound. This is why you see the lightning before you hear the thunder. The sound of thunder is created by the rapid expansion of heated air inside the clouds, which produces sonic shock waves.
To calculate how far away a lightning strike is, you can start counting the seconds between the flash of lightning and the rumble of thunder. Sound travels approximately 1 kilometer in 3 seconds and 1 mile in 5 seconds. Therefore, by dividing the number of seconds by either 3 or 5, you can estimate the distance of the lightning strike.
It is worth noting that the speed of sound is commonly stated as the speed of sound waves through dry air. The speed of sound in other mediums, such as water or wood, would be different and depend on various factors.
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Light travels at 186,282 m/s or 670,616,629 mph
Light travels at an incredibly rapid pace of 186,282 miles per second or 670,616,629 miles per hour. This speed is so fast that it is considered to be the upper limit at which energy or signals can travel through a vacuum.
In comparison, sound moves at a much slower rate of around 343.2 meters per second or 768 miles per hour in air at 20 degrees Celsius. The speed of sound can vary depending on factors such as temperature and humidity, with sound waves travelling at approximately 331.3 meters per second or 761 miles per hour in dry air at 0 degrees Celsius.
The significant difference in the speeds of light and sound becomes evident during events like lightning strikes or fireworks explosions. When lightning strikes, the bright flash of light is visible first because light travels much faster than sound. The sound of thunder, which is created by the rapid expansion of heated air surrounding the lightning bolt's path, reaches our ears several seconds later. This delay between seeing the lightning and hearing the thunder is due to the slower speed of sound waves in comparison to light waves.
It is important to note that lightning itself is not light, but rather electron plasma moving through charged air. The speed of lightning is estimated to be around 224,000 miles per hour, which is significantly slower than the speed of light.
The speed of light, at 186,282 miles per second, serves as a benchmark for understanding the rapid propagation of energy and signals. It is this extraordinary velocity that enables us to witness events, such as the contact between a baseball bat and ball, almost instantaneously, while waiting a fraction of a second for our ears to register the accompanying sound.
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Lightning travels at 224,000 mph
The speed of lightning is a fascinating phenomenon that has piqued the interest of many. While the visible flash of a lightning strike travels at an astonishing speed of light, about 670 million miles per hour, the electrical discharge that we perceive as lightning moves at a comparatively slower pace.
Lightning is not a continuous process but occurs in short, rapid bursts with pauses between steps, known as the step ladder process. This process includes the leader stroke and the return stroke. The leader stroke occurs when negatively charged particles move downward to establish a circuit with the ground. This step is relatively slower, with speeds reaching approximately 224,000 mph or 120,000 m/s. The speed is influenced by the presence of ionizing molecules with different energy levels and atmospheric pressures.
The return stroke, on the other hand, is the faster part of the process. This occurs when electricity moves through the already established channel back towards the sky. The speed during this phase can reach up to one-third the speed of light.
It is worth noting that the speed of lightning is not constant and can vary depending on the specific conditions and stages of the lightning strike. The immense energy involved in a lightning strike results in extremely high temperatures within the lightning channel, reaching up to 30,000 °C, which is approximately five times hotter than the surface of the Sun.
While lightning is incredibly fast, it is not as swift as light, which always travels at the speed of light. However, it is significantly faster than sound, making it a remarkable and powerful force in nature.
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You see lightning before you hear thunder because light travels faster than sound
It is a well-known phenomenon that during a thunderstorm, you see a bright flash of lightning and multiple seconds later, you hear the loud rumble of thunder. This happens because light travels faster than sound.
Light travels at 186,282 meters per second (670,616,629 mph or around 186,282 miles per second), so in theory, nothing moves faster than the speed of light. The speed of sound, however, is much slower, commonly stated as the speed of sound waves through dry air, which is about 343.2 meters per second (768 mph) in air at a temperature near 20°C. The speed of sound changes depending on the temperature and humidity, but reasonable numbers to use are 350 meters per second and 1,200 feet per second (approximately 1,087 feet per second).
The speed at which lightning travels is around 224,000 mph. This speed is faster than sound but slower than light. When you see lightning, you are seeing the bright flash of visible light waves formed by the plasma in the lightning. These light waves travel to your eyes much faster than the rumble or crack of thunder reaches your ears.
Therefore, when you see lightning and then hear thunder, it is because the lightning bolt was far away due to the effect of dispersion, which is the process of distributing things over a wide area. This is similar to watching fireworks; you see the explosion in the sky but hear the boom of the eruption a few seconds later because of the slow speed of sound waves.
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Frequently asked questions
Yes, lightning travels at around 224,000 mph, while the speed of sound is approximately 768 mph in 20°C air.
Light travels much faster than sound, so the visual of the lightning reaches your eyes quicker than the sound of the thunder reaches your ears.
You can calculate how far away lightning has struck by using the speed of sound. Sound travels at approximately 1,087 feet per second or 350 meters per second. When you see a lightning flash, start counting seconds and then divide to see how far away the lightning struck.
