0
Speed of Light
Denoted with the symbol "c," the speed of light is 299,792,458 metres per second and is often rounded as 300,000 kilometres per second or 186,000 miles per second.
1,290 Questions
What is the speed of light in different media air water normal glass diamond and vacuum?
The speed of light is approximately 299,792 kilometers per second in a vacuum. In air, the speed of light is slightly slower than in a vacuum, but the difference is minimal. In water, light travels at about 225,000 kilometers per second, in glass it's around 200,000 kilometers per second, and in diamond it's approximately 125,000 kilometers per second.
Why does speed of light change in different mediums?
Dependence of the speed of sound on the properties of the medium:
The speed of sound is variable and depends mainly on the temperature and the properties of the substance through of which the wave is traveling. For example, in low molecular weight gases, such as helium, sound propagates faster compared to heavier gases, such as xenon. In a given ideal gas the sound speed depends only on its temperature. At a constant temperature, the ideal gas pressure has no effect on the speed of sound, because pressure and density (also proportional to pressure) have equal but opposite effects on the speed of sound, and the two contributions cancel out exactly. In non-ideal gases, such as a van der Waals gas, the proportionality is not exact, and there is a slight dependence on the gas pressure, even at a constant temperature. Humidity also has a small, but measurable effect on sound speed (increase of about 0.1% to 0.6%), because some oxygen and nitrogen molecules of the air are replaced by the lighter molecules of water. Cheers ebs
Can you go faster than he speed of light?
According to our current understanding of physics, it is impossible for any object with mass to travel faster than the speed of light in a vacuum, which is about 299,792 kilometers per second. This limit is a fundamental principle in the theory of relativity proposed by Albert Einstein.
When is the only time that light waves travel at thespeedof light?
Light waves always travel at the speed of light, which is approximately 299,792 kilometers per second in a vacuum. This speed is constant and universal, regardless of the observer's frame of reference, according to Einstein's theory of relativity.
What broadband internet connection travels at the speed of light?
Fiber Optic Broadband is the type of internet connection that travels at the speed of light.
Why does it take more energy to go faster?
"Kinetic energy" is energy of motion. When you, or any object, move faster, you
have more kinetic energy. In order for you or any object to speed up, it needs to
have more kinetic energy, and that energy has to come from somewhere. It can
come from gasoline burning in the engine to turn the wheels faster, rocket fuel
burning in the combustion chamber to accelerate the spacecraft, RF current
through the magnets to drag the protons around the ring faster, or glucose
burning in the muscles to make the legs go faster. But if more speed is needed,
then it'll take more kinetic energy, and that energy must come from somewhere.
From Earth, it takes about 8minutes 20seconds if you travel in a straight line.
What does speed change when a ray of light leaves air and enters a piece of glass?
The speed of light slows down ...
in general, the denser the material, the lower the speed of light.
(For example : air to water to glass.)
The maximum speed is in a vacuum.
What color of light has the gratest angle of refraction when passing from air to glass?
Blue light typically has the greatest angle of refraction when passing from air to glass because it has a shorter wavelength compared to red light. This causes blue light to bend more as it enters the glass medium, resulting in a larger angle of refraction.
Where is the speed of light greater than the speed of light in water?
The speed of light is greater in a vacuum compared to in water. In a vacuum, light travels at its maximum speed of approximately 299,792 kilometers per second, while in water it slows down to about 225,000 kilometers per second.
A reduction of 20 dB corresponds to increasing the distance from the source
by a factor of 10.
So you have to back off to 150 meters in order to reduce the sound level to 60 dB.
Is the speed of light the highest speed possible?
Yes, according to our current understanding of physics, the speed of light in a vacuum is the fastest speed at which energy, matter, and information can travel. Any object with mass that approaches the speed of light would require an infinite amount of energy to accelerate further.
t = 100 s
Recalling that speed or velocity's magnitude v is equal to distance (or displacement)
x divided by time t taken to cover that distance: v = x/t, then t = x/v.
For this case we have:
x = 34 km = 34 000 m
v = 340 m/s
So we get:
t = (34 000 m)/(340 m/s) = 100 s
Do quarks contain infinite energy?
This can be answered by observation and physics:
- Quarks are matter and matter does not contain all energy as there is free energy available in the universe as heat, radiation and gravity etc.
- The theory of relativity relates the amount of energy in any given amount of matter by the equation E=mC2. As a consequence, as the mass of all quarks or any quark is finite, it cannot contain infinite energy.
What is the intensity of light produced by an LED?
The intensity of light produced by an LED is typically measured in lumens. It can vary depending on the specific LED model and its design, but LEDs are generally known for producing high-intensity light output compared to traditional light sources like incandescent bulbs.
Jiffy is an indeterminate period of time originally thought to mean as quick as a flash of lightning. However many technologies have adopted it to express a quick time in their own area and attempted to standardize it:
- Gilbert Newton Lewis defined a Jiffy as the time it takes light to travel one centimetre, which is about 33.3564 picoseconds.
- In electronics, a Jiffy is defined as the time between alternating current power cycles, which is either 1/60 or 1/50 of a second.
- Edward R. Harrison defined a Jiffy as the time it takes for light to travel one fermi, which means that a Jiffy is equal to about 3 × 10−24 seconds. This measure is typically used in astrophysics and quantum physics
- Physics: The time it takes light to travel one centimetre (approximately 33.3564 picoseconds).
- Computing: Various definitions based on the timer system. It varies between 1/60 sec and 1 - 10 ms
- Astrophysics and quantum physics: A complex definition. it may be set to the Planck interval, about 5.4 × 10−44 seconds, which is the time it takes light to move the smallest meaningful length, the Planck length.
Thus the jiffy can be amny durations but the jiffy based on the Plank Length is the quickest of all but it is based on a graininess quantification of space.
For light to travel from the sun to earth.
Compared to air the speed of light in water is?
The speed of light in water is about 25% slower than in air. This is due to water's higher density and refractive index, which causes light to propagate more slowly.
What happens when red and blue filters join?
The red and blue filters put ontop of each other will make magenta
Why is it much more difficult to measure the speed of light than to measure the speed of sound?
It is harder to measure the speed of light simply because it is so fast. The speed of light is 300,000,000m/s, where as the speed of sound is 340m/s. This means that the speed of light is almost 900,000x faster than that of sound.
It is for this reason that you will see lightening before you hear it, and why you can use the lag time between the flash and boom to roughly estimate the distance of the lightning strike. For example, if lightening strikes 1km away from where you are standing, it would take about 3 seconds for the thunder to reach your ears (since the speed of sound is 340m/s, which is about 1km/s). The amount of time that it would take for the flash of lightening to reach your eyes is almost negligible: to travel 1km, it would only take light 0.000003s.
What equation is used to determine speed of light through material?
The equation used to determine the speed of light in a given material is v = c / n, where v is the speed of light in the material, c is the speed of light in a vacuum, and n is the refractive index of the material.
The speed of light depends on the electrical characteristics of whatever medium it
happens to be in at that instant. It has one speed in vacuum, another speed in air,
another in glass, another in water, and yet another speed in jello. When passing
from a more-optically-dense medium to one where its speed is higher, it doesn't
need a stomp on the gas to 'accelerate' to the higher speed.
How fast can a flying saucer go?
The theory of general relativity does indeed allow for faster than light "travel". Not by accelerating to an actual speed that is greater than that of light, but in terms of squishing space in front of you and expanding space behind you, using enormous amounts of energy.
There are galaxies, so far away that we cannot see them, that is speeding away from us faster than the speed of light because the space between it and us is expanding.
If alien ships can do this, well - it is the same as asking if there are aliens in the first place. We don't know.
Which light wave has the fastest speed?
All electromagnetic waves travel at the same speed in vacuum.
The magnitude of the effort is controlled by you, not by the distance of the load
from the fulcrum.
Moving the load farther away from the fulcrum has no effect on the effort. But if
you want to leave the effort where it is and still lift the load with the lever, then
you're going to have to increase the effort.
