[tp widget="default/tpw_default.php"]
Uncategorized

does sound travel faster than the speed of light

does sound travel faster than the speed of light插图

No sound can go faster than light
In fact,the physicist has tweaked some scientific definitions.No sound can go faster than light. But a sound pulse,or more precisely,all the wavelengths associated to a sound,have a group velocity that far exceeds the real physical limits.

Does light travel at half the speed of sound?

neither. it travels slightly slower than the speed of light depending on method used, relay nodes and path but on average you can reach sometihng like half or 1 the speed of light in the long run which is still undreds of thousnads times faster than the speed of sound. 115 views.

What Einstein said on faster than light travel?

Albert Einstein Quotes Quotable Quote. “We all know that light travels faster than sound. That’s why certain people appear bright until you hear them speak.”. ― Albert Einstein. Read more quotes from Albert Einstein.

Is there any thing that travels faster than light?

We all know the number one traffic rule of the universe – nothing can travel faster than the speed of light. And that happens to be 299,792.458 kilometres per second. But why is it so? Before the 1600s most people assumed light moved instantaneously. Galileo was among the first to think that light travelled at a finite speed.

Can the soul travel faster than light?

Your body is just a mass vehicle. In the environment called Universe the maximum speed of that vehicle is near the speed of light. For the speed of light you need another vehicle. Without vehicle your soul will travel faster than the speed of light.

How fast does sound travel through air?

The speed of sound through air is about 340 meters per second. It’s faster through water and it’s even faster through steel. Light will travel through a vacuum at 300 million meters per second. So they’re totally different scales. No information can propagate faster than the speed of light.

How are light and sound different?

Light and sound are very different. Sound is actually a mechanical disturbance through air or another medium. Sound always needs a medium to travel through and the type of medium determines its speed. Imagine a bunch of molecules bouncing around in the air. If you hit an object or make a fast motion, the molecules that you push are going to hit …

How far away is lightning?

This speed difference does become apparent, for example, with lightning. You’ll always see lightning before you hear it, because typically lightning will be a mile away, two miles away. That’s a great enough distance that that speed difference becomes apparent to your brain.

What happens when you hit an object?

If you hit an object or make a fast motion, the molecules that you push are going to hit the ones in front of it. You’ll get this disturbance in the direction of travel of however you made the initial motion, and it will move through the medium. That’s how sound travels—as a pressure wave.

Can information propagate faster than light?

No information can propagate faster than the speed of light . If you have light that’s going through a media, it can travel slower than that. But the speed of sound and speed of light are totally incomparable. You normally don’t notice this speed difference on a day-to-day basis.

Is light a pressure wave?

Light, on the other hand, is not a pressure wave—it’s a fundamental particle. One ray of light is typically called a photon, and it’s an electromagnetic disturbance. Light doesn’t need a medium to travel. The speed of sound through air is about 340 meters per second.

Why is the speed of light a universal constant?

This is why the speed of light is used as a universal constant by many astronomers when calculating the distance to points relative to their location to the Earth.

How does light affect sound?

Light maintains a constant speed throughout the universe and is the fastest that anything can travel between two points. Meanwhile, sound relies on air pressure to transfer waves along its trajectory. This means that temperature and barometric pressure change the speed at which sound travels.

Why does sound travel so slowly in cold air?

For example, sound moves much more slowly in cold air, because the gas molecules in the air move more slowly. Warming the air ensures that sound waves can move more quickly through it.

How fast does light travel?

Light travels at a considerably higher speed than sound. Light travels at a constant speed of 186,000 miles per second, but the speed of sound is only 761.2 mph. There are a number of differences between how sound and light travel. Light maintains a constant speed throughout the universe and is the fastest that anything can travel between two …

When was the speed of light first measured?

The first quantitative measurement of the speed of light took place in 1676, thanks to the calculations of Ole Roemer.

How did Robertson transmit sound waves?

Robertson and his colleagues transmitted sound pulses from the sound card through a loop made from PVC plumbing pipe and connectors from a hardware store. This loop split up and then recombined the tiny waves making up each pulse.

How fast is light traveling?

The standard metric for the speed of light is that of light traveling in vacuum. This constant, known as c, is roughly 186,000 miles per second , or roughly one million times the speed of sound in air. According to Einstein’s work, matter and signals cannot travel faster than c.

When looking at a pulse that entered and then exited the pipe, before the peak of the entering pulse even?

This led to a curious result. When looking at a pulse that entered and then exited the pipe , before the peak of the entering pulse even got into the pipe, the peak of the exiting pulse had already left the pipe.

Who is the physicist who explains how sound pulses work faster than C?

However, physicist William Robertson at Middle Tennessee State University in Murfreesboro, along with a high school teacher, two college students and two high school students, managed to, depending on how you look at it, transmit sound pulses faster than c using little more than a plastic plumbing pipe and a computer’s sound card.

Who used similar principles to make pulses of light travel backwards and faster than c?

The Biggest Popular Myths. In an unrelated previous experiment, Robert Boyd at the University of Rochester used similar principles to make pulses of light travel backward and faster than c. See a graphic or animation. or read the story.

Is it possible to send information faster than light?

Robertson explained that although it is not possible to send information faster than light, it seems these techniques could make it possible to route slower-than-light signals in electronic circuits faster than before. Life’s Little Mysteries. Light Travels Backward and Faster than Light.

Who took the photo of the sound pulse?

Photo taken by Davide Guglielmo (brokenarts). There are no usage restrictions for this photo. A group of high school and college teachers and students has transmitted sound pulses faster than light travels—at least according to one understanding of the speed of light.

How to achieve superluminal sound velocity?

In their experiment, the researchers achieved superluminal sound velocity by rephasing the spectral components of the sound pulses, which later recombine to form an identical-looking part of the pulse much further along within the pulse. So it’s not the actual sound waves that exceed c, but the waves’ “group velocity,” or the “length of the sample divided by the time taken for the peak of a pulse to traverse the sample.”

Why do sound waves travel faster through a loop filter?

Due to anomalous dispersion (which changes the wave speed), sound pulses traveling through the loop filter arrived at the exit sooner than pulses traveling straight through the PVC. With this experiment, the group velocity could actually reach an infinitely small amount of time, although the individual spectral components still travel at the speed of sound.

How long is a PVC pipe filter?

To rephase the spectral components, the sound waves were sent through an asymmetric loop filter on a waveguide of PVC pipe, about 8 m long. The 0.65-meter loop split the sound waves into two unequal path lengths, resulting in destructive interference and standing wave resonances that together created transmission dips at regular frequencies.

What is the NSF STEP grant?

The experiment was conducted by two undergrads, an area high school teacher and two high school students, who received funding by an NSF STEP (Science, technology, engineering, math Talent Enhancement Program ) grant. The grant aims to increase recruitment and retention of students to these subjects.

Does a negative velocity exceed the speed of light?

It might not seem that a negative velocity would exceed the speed of light, but in this case, Robertson said, the speed of the pulse is actually much faster than c.

Does Einstein’s law violate special relativity?

Although such results may at first appear to violate special relativity (Einstein’s law that no material object can exceed the speed of light), the actual significance of these experiments is a little different. These types of superluminal phenomena, Robertson et al. explain, violate neither causality nor special relativity, nor do they enable information to travel faster than c. In fact, theoretical work had predicted that the superluminal speed of the group velocity of sound waves should exist.

Can sound waves travel faster than light?

Image credit: Bill Robertson, et al. For the first time, scientists have experimentally demonstrated that sound pulses can travel at velocities faster than the speed of light, c. William Robertson’s team from Middle Tennessee State University also showed that the group velocity of sound waves can become infinite, and even negative.

Why does light travel faster than sound?

Light travels faster than sound because sound waves can only travel as waves of pressure in a medium, whereas electromagnetic waves, of which light is made, move on their own even through vacuum. Light’s speed decreases a little when it goes through various mediums, as electromagnetic waves interact with the medium at a subatomic level.

How can sound waves be compared to ripples?

Sound waves can be compared to ripples on the surface of water after a pebble is thrown into it; the water surface becomes compacted in certain areas and radiating waves can be observed. Sound can only travel through mediums where the density of molecules is high enough to create a wave.

How fast does sound travel through air?

The denser the medium, the faster sound will travel. Sound travels through air at the speed of 1,115 feet per second, through water at 4,757 feet per second and through iron at 16,404 feet per second.

What is the most common medium for humans to experience the movement of a sound wave?

Air is the most common medium for humans to experience the movement of a sound wave. The speed of sound in air , as in any medium, does not depend on the qualities of the sound, such as amplitude, but only on the nature of the medium and its characteristics.