Speed of Light

The speed of light is constant, so we can use it to calculate distance by measuring the time it takes for light to travel from a source to an observer. This principle forms the basis of astronomical measurements and allows us to determine vast distances in the universe.

Faradic is high frequency current(50-100Hz), where as galvanic is low frequency as compare to faradic

faradic is of short duration ranging from 0.01 to 1ms, galvanic is of log duration of 30 min

faradic is use to stimulate innervated muscles, and galvanic to denervated mucles

faradic give mild pricking type of sensation where as galvanic give stabing type of sensation

Index of refraction of air is very low, like 1.0003. The index of refraction is a function of wavelength. X-rays and gamma rays pass through air at c. c is 299,792,458 m/s, so speed of visible light in air is about 299,700,000 m/s.

The speed of light (and all other forms of electromagnetic radiation) in vacuum is determined by
the electrostatic permittivity (ε0) and magnetic permeability (μ0) of free space.

An interesting thought ... we have no way of knowing whether these physical constants are the same
numbers today that they have always been. If either of them has changed since the birth of the universe,
then the speed of light changed, and our observations of the earliest cosmos give an erroneous number
for the age of the universe.

But anyway, that's what these quantities are today, and they're what determines the speed of light,
as is so neatly predicted by Maxwell's equations and verified spot-on by the best measurements.

at the speed of light, a little over 8 minuets.

Every color of light has the same identical speed in vacuum. Radio, X-rays,
microwaves, heat waves, and gamma rays also all have the same speed.


All colours travel at the same speed.

The speed of the light decreases, and its wavelength increases by the same factor.

The breakdown of Newton's laws is not your biggest problem with that

situation. The main problem is the fact that the system which you have

postulated is impossible. No particle to which Newton's laws might be

expected to apply at all ... i.e. particles with mass ... can move with

the speed of light.

Light is given by a subatomic particle called a photon. All types of light are transferred by this from gamma rays to microwaves. Although It is called a particle from the double slit experiment we can see that the photon can act like particle and a wave

The speed wouldn't harm us, if we could reach it. But we have no way to get there yet.

If you had a rocket or a car carrying enough fuel to keep accelerating you at 2G's,

let's say ... night and day, 24 hours around the clock ... then if you could stand the

load of dragging around double your weight, it would take you something like 6 months

of that to reach 1/2 the speed of light.

The speed of light in a vacuum is 186,000 miles per second. In water, the speed is about 25 percent less or about 139,500 miles per second.

It seems to me that, to understand that, you need an understanding of the Huygens-Fresnel principle. Check the corresponding Wikipedia article; it has a nice illustration that shows how refraction is derived from this principle.

According to our current understanding of physics, no object with mass can reach the speed of light. As an object with mass accelerates, its energy increases, requiring an infinite amount of energy to reach the speed of light. Special relativity indicates that as an object with mass approaches the speed of light, its mass will also increase, making it more difficult to accelerate further.

The answer depends on where in the vacuum cleaner and on the state of the cleaner. In any empty part of the vacuum cleaner, the speed of light is approx 299,700,000 metres per second. In a full dust bag, though, the speed may well drop to zero.

The speed of light in empty space is constant, i.e., always the same. However, the speed of light in another medium can change. So, if a planet has a denser atmosphere than Earth, the speed of light will probably be slightly less than here.

Aircraft cannot fly at the speed of light due to limitations imposed by physics. The speed of light is approximately 186,282 miles per second and is much faster than any aircraft is capable of traveling.

as it reaches light speed the matter will just start vanishing and disappearing which is why you can not go into light speed, light is not matter. warp drive is really the only way because it makes a sphere in the space time continuum, pushing the space forward but not you and you stay in really time and it would take less time the more concentrated the space-time is.

The SI unit for frequency of light is the hertz (Hz). It represents the number of cycles (or oscillations) of a wave per second.

The electrons themselves do not move at the speed of light. Electrons in a DC circuit move because of the application of an electric field. Like molecules in a gas, the charge carriers, electrons, undergo a Brownian-like motion through the conductor. The average drift velocity can be calculated by I=nAvQ, where I is current, n is the number of charged particles, A is the cross section area of the conductor, v is drift velocity, and Q is the charge on each particle.

Protons must collide at high speeds to overcome their electrical repulsion caused by their positive charges. The high speeds provide enough kinetic energy to bring the protons close enough together for the strong nuclear force to then overcome the electromagnetic force and bind them into deuterium.

The number of miles you can travel in one day depends on factors such as mode of transportation, speed, and stops. On average, a car can travel around 300-500 miles in a day, while a person walking may cover 10-20 miles. It's important to consider rest breaks, traffic, and road conditions when estimating daily travel distance.

No. Three types of speed must be distinguished here:

1. The random movement of electrons is pretty fast, but still only a fraction of the speed of light. They will have this movement, whether there is a current or not.

2. The drift velocity is the average velocity of electrons when there is a current. This velocity is typically a fraction of a millimeter per second.

3. The velocity of the electric signal itself is typically about 2/3 the speed of light in a vacuum (that is, about 200,000 km/sec). What happens here is that energy is transferred from one electron to another. Imagine one electron bumping into another and pushing it forwards.

The speed of light is more than 850 thousand times the speed of sound.