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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 statement best describes frequency and pitch?
Frequency refers to the number of cycles per second of a sound wave, measured in Hertz (Hz). Pitch, on the other hand, is the perceived highness or lowness of a sound and is directly related to the frequency of the sound wave - higher frequency sounds typically have a higher pitch and vice versa.
the velocity of light is maximum in vacuum I.e 3*10^8 m/s. as the density of the medium increases the velocity of light decreases in the medium. so the velocity of light is less in watt than in atmosphere. the thicker the medium is the slower the electromagnetic wave, so the velocity of light will be minimum in the thickest medium.
What is a X-rays speed of light?
All electromagnetic waves involves the propagation of electric and magnetic fields though space with speed 3 x 108 ms-1 .Therefore , the speed of x rays would probably be same as the speed of light.
Only if you're a complete fool. Kerosene is a light oil, made of hydrocarbons. It is used for heating, cooking and lighting. Some people use it as a treatment for arthritis by rubbing it on painful joints. It's also been used as an insecticide against mites and fleas.
if kerosene enters the liver then it becomes a serious problem and Doctors advise against making the affected person vomit
How do you represent the speed of light in science?
The speed of light in a vacuum is represented by the symbol 'c' and is approximately 299,792 kilometers per second (or about 186,282 miles per second). It is a fundamental constant in physics and plays a crucial role in many scientific equations and theories.
What did Aristotle contribute to the discovery of the speed of light?
Aristotle did not directly contribute to the discovery of the speed of light. The speed of light was first measured by Ole Roemer in the 17th century using observations of Jupiter's moon Io, and later refined by other scientists. Aristotle's work primarily focused on natural philosophy and did not extend to the study of light and its speed.
300000 kps likely refers to 300,000 kilometers per second, which is an extremely high speed that is faster than the speed of light. This speed is not achievable with our current technology or understanding of physics.
How long would it take to get to Uranus if traveling at the speed of light?
Minimum distance from Earth to Uranus: 2.582 x 1012 m
Speed of light: 3.00 x 108 m/s
d = vt
t = d/v
t = 2.582 x 1012 m/3.00 x 108 m/s
t = 8606.67 s = 2.39 hours
Why did Einstein think that we can't travel at the speed of light?
He didn't. In 1676 a fellow named Olaf Roemer noted that the time elapsed between eclipses of Jupiter with its moons became shorter as the Earth moved closer to Jupiter and became longer as the Earth and Jupiter drew farther apart. This anomalous behavior could be accounted for by a finite speed of light. He calculated that the speed of light was something like 2.14 x 10^8 meters per second. The actual speed is closer to 3x10^8 m/s, but considering the time at which the measurements were done this is reasonable.
Einstein hypothesized that the speed of light is constant for all observers.
Can a space ship travel at the speed of light?
The "escape velocity" for Earth is about 11.2 kilometers (7 miles) per second.
If you can achieve that upward velocity, then Earth's gravity can never pull you
back. The Apollo spacecraft, set up to park in Earth orbit for a while and then
to eventually continue on to the Moon, reached speeds not much greater than
escape velocity, and took something like three days to make the trip in each
direction.
11.2 kilometers per second is about 0.0037 percent of the speed of light.
Suppose we launch a robotic space probe, and since it has no people in it, we
can really put the pedal to the metal and accelerate to 100 times the Earth's
escape velocity. That's still only about 0.37 percent of the speed of light.
Put it another way . . . Think of a really hot car, with a streamlined body, an
engine that burns pure rocket fuel, and steel-studded tires that never slip, and
the car does zero to 60 in one second. Of course, that's 2.7 G's, so the driver
sinks way back into his seat, all the blood rushes to his knees, and he passes
out. But we've got no time to worry about him. Luckily he was able to switch
the car into full robo-drive while he was still conscious, and it's steering itself
straight and level. Also, since we're receiving fuel continuously by radio, we
don't have to worry about ever running out, and we can keep accelerating at
2.7 G's for as long as we want.
-- We're doing another zero-to-sixty every second.
-- How long will it take us to reach the sea-level speed of sound ?
-- How long will it take us to reach 1/2 of the speed of light ?
Answers:
-- Sea-level sound barrier . . . 12.7 seconds
-- 50% of the free-space speed of light . . . 64.7 days
Light travel faster in water or kerosene?
Light travels faster in water than in kerosene because water has a higher refractive index than kerosene. The speed of light in a medium is determined by its refractive index, with higher refractive indices typically resulting in faster light propagation.
What does the index of refraction best describe?
Refractive index is the ratio of speed in a vacumme as to speed of light in a medium. The slowest speed of light is attain by use extremely cold sodium atom as light medium and it is succeed to slow down the speed of light from 186,000 Mile/second to 38 Mile/hr (300,000,000 m/s -> 17 m/s).
This account to refractive index of 17,621,000
The speed of light is 2.997925 x 108m/s, so 2.997925 x 105km/s
Will the human body withstand speed of light?
Technically yes. Your thoughts travel approximately 1500 times faster than the speed of light ( That's 279000000 miles per second) So when you think to move your leg, your thought travels from your brain to your leg faster than light would. but you can phyicly move your body parts faster than the speed of light
If you traveled at speed of light how long would it take you to get to Pluto?
Here's a rough, back-of-the-envelope, order-of-magnitude, conceptual estimate:
Earth's average distance from the sun is 93 million miles.
Pluto's average distance from the sun is 3.67 billion miles.
So, over the course of a few million years, the average minimum separation (per orbit) between Pluto and Earth is about 3,577,000,000 miles.
The speed of light is 186,282 miles per second.
At that distance and speed, the time to travel from Earth to Pluto = (3,577,000,000 / 186,282) = 5hours 20 minutes
What happens to the speed of light when it travels from air into glass?
The speed of light decreases when it travels from air into glass because the glass has a higher refractive index than air. This causes the light to slow down as it moves through the denser medium.
Do light rays travel in straight lines?
Theoretically they do
Not theoretically, they do travel in waves.
See my answer here:
What do astronauts use to measure the speed of light?
The speed of light in air was first accurately found using earthbound equipment (as opposed to astronomical techniques) by Hippolyte Fizeau in 1849, using ideas that were mooted many years before by carious scientists - including Galileo. in Fizeau's experiment a beam of light was directed at a mirror several thousand metres away. On the way from the light source to the mirror, the beam passed through a rotating cog wheel. At a certain rate of rotation, the beam could pass through one gap on the way out and another on the way back. But at slightly higher or lower rates, the beam would strike a tooth and not pass through the wheel. The whel was manipulated until the beam was detected both on the outward and return journey. Knowing the distance to the mirror, the number of teeth on the wheel, and the rate of rotation, the speed of light could be calculated. Using this method Fizeau reported the speed of light as 313,000 kilometres per second. In 1926, Michelson used a rotating prism to measure the time it took light to make a round trip from Mount Wilson to Mount san Antonio in California USA, a distance of about 22 miles (36 km). The precise measurements obtainable from this more sophisticated arrangement yielded a speed of 186,285 miles per second (299,796 kilometres per second), very close to the accepted figure today - a figure that is obtained by much more sophisticated and aurate techniques. Don't forget, though, that the speed of light will vary considerably depending upon what medium the light is passing through. The above figure represnted the speed of light in air; in a vacuum it is slightly faster, but in dense media like glass or quartz, the speed of light is considerably reduced.
If time stops at the speed of light how do photons move?
Time for the object or person in question stops. This does not affect the objects around which aren't travelling at that speed or the region of spacetime which is around them. A simple and possible explanation is that time is stopped for the photon, but this stays unnoticed because we are not moving at that speed and so we cannot say what is happening to the photon.
What is the speed of red light?
The wavelength is about 400nm, it's very easy to get the frequency with this data.
The speed of light in a vacuum is approximately 3.00 x 10^8 meters per second. It is a fundamental constant in physics and represents the ultimate speed limit in the universe. The value you provided, 1.69 x 10^8 m/s, appears to be incorrect.
What is speed of light in air?
The speed of light in air is approximately the same as in a vacuum, around 299,792 kilometers per second. However, it may be slightly slower in air due to the presence of air molecules which can cause some scattering and absorption of light.
What is the speed of light in empty space?
The speed of light in empty space is approximately 299,792 kilometers per second (or about 186,282 miles per second). It is considered a fundamental constant of nature and plays a crucial role in our understanding of the universe.
Is the speed of light the same in any material?
The speed of light (c) in a vacuum, is exactly299,792,458 meters per second (ms-1), which rounds up very nicely to 300,000,000 ms-1, which scientists write as 3 x 108 ms-1.
In more dense media the speed is slower,
e.g. # Air, only slightly less than c, speed is 0.9997 of c. # water 0.75 of c. # fused quartz 0.686 of c. # crown glass* 0.658 of c. # dense flint glass* 0.60 of c. # diamond, approx 0.41 of c. CALCULATIONS The speed of light, using a very close approximation for calculation purposes, is taken as 3.0 x 108 m/s (metres per second). i.e. 300,000,000 m/s The greater the refractive index of the medium, the slower the speed of light in that medium/material. The speed of light in a vacuum [c] divided by the velocity of light in the material [v] equals the refractive index [n] of the material. Examples 1. calculate the refractive index of space: c/c equals 1 2. water (the speed of light in water is 225,056,264 m/s): c/ 225056264 equals 1.333 Inversely, if we know the refractive index of a material, we can calculate the velocity of light through that material, i.e. the speed of light [c] divided by the refractive index [n] equals the velocity of light [v] in that material Using the example of water, refractive index 1.333 :- 300,000,000 [c] divided by 1.333 [n] equals 225,056,264 [n] i.e. the velocity of light in water is 225,056,264 m/s. This is 225,056,264/300,000,000 ths the speed of light, or 0.75 of c. SOME REFRACTIVE INDICES * vacuum1.00 * air 1.0003 * water 1.333 * fused quartz 1.4585 * plexiglass 1.51 * crown glass* 1.52 * diamond 2.417 * gallium phosphide 3.50 *Crown glass is a type of glass used in lenses, and has a lower refractive index than flint glass which is also used in lenses. For more information, see Related Links below this box
Red light has a wavelength of approximately 700 nm(which corresponds to a frequency of about 430 THz), while green light would be about 535 nm(frequency of 560 THz).
Doppler formula for the blueshift effect is:
f'=(c/(c+v)) * f, so we get:
v = c * ((f/f')-1)
v is radial speed from source to observer. Negative v indicates the velocity vector has to point towards source.
Calculating:
v = -0.232 c , which would be about 70000 km/s.
