2 (no units)

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.

Santa's estimated travel speed is at least 32,000 miles per hour.

Mach 5.

The speed of light in any medium is
speed of light in vacuum/refractive index of that medium.

No, Albert Einstein suggested the idea of travelling at the speed of light and what would occur to physical properties, which lead him to special and general relativity.

However, he never said it was possible to do so.

Quite the opposite actually, he discovered that as an object travels faster and faster through space, it requires more and more energy to go even faster, to the point that if an object were to travel onward to the speed of light, it would require all of the energy in the universe to push it to that speed. It's also known as relativistic mass.

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.

If passed through a convex lense, then yes the parallel rays will meet.

The speed of light is 2.997925 x 108m/s, so 2.997925 x 105km/s

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.

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.

Speed of light (in vacuum)= approx 671,000,000 mph.Speed of sound (in air at sea level) = approx 760 mph.

The distance between planet Earth and the Sun is 149,597,892 kilometers

The speed of light is 299,792,458 meter per second

149,597,892,000 m / 299,792,458 m/s = 499,00

It would take 499 seconds = 4 minutes and 19 seconds

2 x 108 ms-1

"Natural light" typically refers to light that originates in the sun. "Artificial light" typically refers to light that originates in human-made devices.

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.

To travel at the speed of light you would have to BE light so i guess you would became an even brighter light

The switch to turn on the lights will work but no light will come on as you are already at that speed

Simply looking at a mirror requires reflection and refraction. By looking at a mirror, light reflects off of you and on to the mirror and back at you, and the light will refract throught the convex lenses in your eyes for you to see your reflected image.

You can also look through a microscope, because microscopes are filled with lenses and a few mirrors.

You can also put a stick in a glass of water to show refraction. Put the stick in at about 45 degrees, and the stick will look like it is broken in half, due to refraction. If you look at the the stick from under the cup at a corner, you can only see the part of the stick that's under the water, and if it's still in a 45-degree angle, it will have a relflection right on the water's surface, and both the stick and its reflection will form an angle of about 90 degrees. This is a way to prove the law of reflection.

there is no such thing as a free lunch power consumption is directly proportional to current draw firstly you need to convert mains voltage to12volt via a transformer the advantage to 12 volt lighting is only recognised when using lower wattage halogen or led lighting. as far as i am aware the use of a mains voltage 100watt globe draws the same if not slightly less than a12volt 100watt light as the transformer uses power (in the form of heat) to produce 12volt at least this is what all my "sparky" contacts tell me . my own experience has shown led lighting to be the way to go , i am using a small deep cycle battery ,a small solar panel and leds so far so good with more and more 12volt led lights becoming available

No. density is based on molecular mass. Air is considered a gas. Gases have lower densities than liquids at 'room temperature'.

around 60 or 65. there ment for racing off road and low end speed