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 does the Refractive index of a material signify?
The refractive index of a material signifies how much light slows down when it enters that material compared to its speed in a vacuum. It is a measure of how much the material can bend or refract light rays. Different materials have different refractive indices, which can impact how light interacts with them, such as causing light to be bent when passing through a lens.
How can you convert the speed of light in km per second by dimensional analysis?
What do you want to convert it to ??
Example: Convert [ 'Q' km per second ] to [ miles per minute ].
Use:
(60 sec/min) = 1
(1 mile/ 1.609344 km) = 1
(Q km/sec) x (60 sec/min) x (mile/1.609344 km) = (Q x 60/1.609344) x (km-sec-mile/sec-min-km)
= 37.2823 Q mile/min
How much time you need for 15km with the speed of light?
About 0.00005seconds in air. The spee of light in air is nearly 300000km/s. So, time required will be 15/300000 seconds which is 0.00005.
What is the clearest image produced by a lens?
The clearest image produced by a lens is obtained when the lens is properly focused and there is no aberration, distortion, or other optical imperfections. This results in a sharp and clear image with accurate representation of details and minimal blurriness. The clarity of the image is influenced by factors such as the quality of the lens, the aperture setting, and the distance between the lens and the object being photographed.
What happens when light traveling at an angel passes from one material into another?
When light traveling at an angle passes from one material into another, it undergoes refraction. Refraction is the bending of light as it passes from one medium to another, due to the change in the speed of light. The degree to which the light bends depends on the angle of incidence and the refractive indices of the materials involved.
Does the speed of light have anything to do with image resolution-clarity of modern TV?
No, the speed of light does not directly affect the image resolution or clarity of modern TVs. Image resolution and clarity depend on factors like the display technology, pixel density, and image processing capabilities of the TV. The speed of light refers to how fast light travels, which is crucial in transmitting the images to your TV, but it does not affect the resolution or clarity of the displayed image.
It appears that you wish to know which would result in falling faster, parachuting from an airplane flying above the earth, or parachuting from one flying above the moon.
The moon has no air, so whether you use a parachute or not would make no difference. You would fall at an acceleration of about one-sixth that of earth, or about 1.6 meters per second per second. The velocity at which you hit the ground depends on the height. It's the square root of twice the height times the acceleration. From 10 meters up you would land at 5.6 m/s, which might be survivable. Perhaps you could try to land on top of your useless parachute, as a cushion. From 100 meters you would hit at about 18 m/s, which is over 40 miles per hour. From "regular" airplane height, 1000 meters or more, your impact velocity would be over 60 m/s.
In earth's atmosphere your fall would be limited to perhaps 200 km per hour even without a parachute, because of the friction of the air on your body. With a parachute, you could fall very slowly, perhaps 10 km/h (that's like 3 m/s or 6 miles/hour) or less, and avoid injury.
The greatest difficulty in your experiment would be flying the airplane above the moon, because (as we already noted) the moon lacks an atmosphere. Instead you would need to use a rocket, or build a tall tower from which to jump. In either case, you would almost certainly be killed upon striking the ground, regardless of the moon's lesser gravity. As an exercise, you should calculate the greatest height from which your fall would not cause you injury.
Some of the numbers shown here are undoubtedly in error. Velocities are shown in miles/hour, m/s and km/h, and the conversions between them were sloppy. See
http://en.wikipedia.org/wiki/Equations_of_Motion
for the correct equations, and work out the actual consequences of your experiment for yourself.
Is the brain faster than light?
Speed of light is a lot faster than the electro-biochemical events that our brain runs on.
Are quarks traveling at the speed of light?
Quarks have not been observed to exist separately - they are "confined" within larger particles such as protons and neutrons, that are made up of several quarks (3 each, in the case of protons and neutrons).
What is the only time that light waves travel at the speed of light?
Light always travels at the speed of light.
The only time that's 299,792,458 meters per second ( " c " )
is when it's traveling in vacuum.
What is the fastest speed of anything in universe?
The fasted "known" speed in the universe is the expansion of the universe itself, at about 74km/s per 3m lightyears. That is incredibly fast. The fastest obseved would be light at of course, lightspeed, or rougly 300,000,000m/s.
The speed at which a wave travels through a medium is called?
The Speed At Which Wave Travels Is Known As Wave Velocity.It Is Denoted As 'v' which Equals The Product Of Its Frequency And Wavelength.
How fast can light travel in a second?
Sunlight takes about 8 minutes, nineteen seconds to reach Earth so that is about 499 seconds.
Why cant the speed of light be exceeded?
In our Universe, any attempt to exceed the speed of light, as viewed in any frame, by a particle with mass, will be defeated by the laws of the Universe we happen to live in. Whether or not we like that fact is irrelevent: that's the laws of this Universe.
It arises from the fact that an object getting close to the speed of light will get more and more massive as it gets closer and closer. Because of that, it will become harder and harder to make it go faster, as it takes more energy to accelerate an object with more mass.
Five examples of acceleration?
-- Start a car moving from a stop-sign.
-- Slow a car down when approaching a stop-sign.
-- Turn a corner in a car.
-- Turn a corner on a bicycle.
-- Turn a corner on roller-skates.
-- Throw a stone at a stop-sign.
-- Drop a stone into a pond.
-- Throw a stone horizontally half-way across a pond.
-- Throw a stone up to get it all the way across a pond.
-- The moon sailing around the Earth in its orbit.
-- Practically every motion of anything that you ever see during daily life on Earth.
We're in the category of
how we handle scientific terms like this.
Contrary to popular usage, "acceleration" does notmean increasing speed, and
an object that's accelerating is not necessarily expected to be moving faster.
Acceleration means any change in speed ordirection of motion, and any object
that's not moving at a constant speed in a straight line is accelerating.
A car speeding up after leaving a stop-sign is accelerating, with positive acceleration
because its speed is growing. A car slowing down as it approaches an intersection
is accelerating, with negative acceleration because its speed is shrinking.
A car or bicycle on a curve, as well as the moon and any other object in a gravitational
orbit, is accelerating, because, although its speed may be constant, the direction
of its motion is changing.
And while we're being more precise than usual, velocityand speed are two
different things. Everybody knows what speed is. Velocity is speed and the
direction of the speed. If you drive around a curve at a steady 30 mph (48 kmph),
your velocity is changing, because, although your speed is constant, your direction
is changing.
And any change of velocity is called . . . . . acceleration.
What happens to light rays when they pass through objects such as water glass or plastic?
I'm guessing the light ray is coming from air. When light passes from air to water, glass or plastic, the light ray "Refracts" meaning it bends towards the medium (The middle). However this is only the case when the second material the light passes through is denser than the original. In your case, air AND vacuum are less dense, infact they are the most dense with a density level of 1. Something like water on the other hand has a density of 1.33 meaning the ray of light that travels from air to water will bend towards the medium.
Lets take another example using one of the material stated in the question, I will continue using water as an example and... Crown glass. Remember water's density level is 1.33 and crown glass has a density level of 1.52. Lets say the light ray travels through water first this time which is known as incident ray and will pass into crown glass. Because crown glass is more dense than water, the ray will bend towards the medium. Ok now lets flip the question around, if the light ray passed through the crown glass first then refracted into water, the complete opposite would now happen; because crown glass is more and water is less dense, the ray this time will bend AWAY from the medium.
What speed does santa have to travel?
Santa's estimated travel speed is at least 32,000 miles per hour.
How do you calculate speed of light wave with refractive index?
The speed of light in any medium is
speed of light in vacuum/refractive index of that medium.
Can an object containing heat emit x rays?
Thermal energy is nearly the same thing has heat.
The distinction has some linguistic aspects.
If I add heat to an object, I increase its thermal energy.
Anything that contains thermal energy contains heat or heat energy.
The words "heat energy" and "thermal energy" are used interchangeably.
The word heat has other flexible uses. It can be a verb.
Outside of science, the terms heat and temperature are use to mean the same thing, but this is technically wrong in scientific usage.
Can parallel rays of light meet?
If passed through a convex lense, then yes the parallel rays will meet.
How many times is light faster than speed?
After more than 60,000 answers posted to this website, I must admit that this
question is in a class by itself ... grammatically precise, taut in its phrasing and
economically expressed, and signifying nothing.
One may as well ask 'Does a submarine sail lower than depth ?', 'Does an airplane
rise beyond height ?', 'Is an infant younger than age ?', 'Was Solomon smarter than
wisdom ?', and 'Are most diamonds more expensive than cost ?'.
Did you mean to ask "How many times is light faster than sound ?" ?
If so, you failed, and then proceeded to fail again in your proofreading.
An earlier answer stated the opinion that this question has no answer, but I shall
disagree. To ponder and puzzle over the matter of whether this question has an
answer is pointless, since the question itself, as stated, is utterly without meaning.
What should you make in a working model in physics and how?
I think you should make a "HYDROELECTRICITY". but the process is that the electricity will be produced by domestic waste water and you can also include "The purification of water'. you can purify the domestic waste water after producing electricity through hydroelectricity.
What is the speed of light and sound in mph?
Speed of light (in vacuum)= approx 671,000,000 mph.Speed of sound (in air at sea level) = approx 760 mph.
The speed of light in vacuum is a universal constant. The distance around the earth depends on the line of measurement. Because of its rotation, the earth is not a perfect sphere: its equatorial radius is 0.3% greater than its polar radius. Consequently the measurement is affected by the exact line along which the radius is measured.
Furthermore, there are two kinds of variations in the equatorial radius. One is a long-term variation caused by the distribution of mass on the surface: possibly the ocean mass. There is also the short term variation caused by the gravitational pull of the moon.
What is the speed of a jet plane in miles per hour?
There are many variables...especially when trying to decide what the "average" plane is.
1 knot = approximately 1.15 M.P.H. e.g. 100 knots = 115 m.p.h.
Average (Typical Cruising) Speeds:
Light Single Engine piston powered airplane - 110-130 knots.
Light Single Engine Turbine Powered Airplane - 150-180 knots.
Light Twin Piston - 180-200 knots
Heavy Twin Piston - 200-250 knots
Twin Turboprop - 250-300 knots
Turbine (pure-jet) Powered Jetliner or Corporate Jet - 450 - 500 Knots
Rocket Powered e.g. STS / Space Shuttle - 15,300 knots (It's also the fastest glider.)
The speeds vary greatly between models. For example, some single engine pistons can't exceed 100 knots but another model / design can exceed 200 knots.
