What is light Addition 20 points 20

light, which has wave-particle duality.

The theory of particles, led by Newton, once dominated history. Think of light as a particle. It has the properties of reflection, refraction, and linear propagation.

Later, the Young's double-slit interference test found that light has fluctuating properties. Subsequently, it was discovered that light has diffractive and interfering properties. Since then, the wave doctrine has become dominant.

On the basis of summarizing his predecessors, Maxwell perfected the theory of electromagnetism, established a perfect Maxwell equation, and successfully explained various electromagnetic phenomena. By solving a system of mathematical equations, Maxwell discovered the existence of a substance called electromagnetic waves, and proposed that light is also an electromagnetic wave. Soon, Hertz verified the existence of electromagnetic waves in the laboratory.

Albert Einstein published four important articles in 1905. One of them, for which it won the Nobel Prize, is the first to explain the photoelectric effect. Albert Einstein believed that light is particle-like and that its energy is quantized and discontinuous.

Soon after, Dr. de Broglie** demonstrated the existence of waves of matter and won the Nobel Prize. Thus, it is explained that matter has the property of wave-particle duality.

In modern physics, optics belongs to an independent branch of physics. The study of it is mainly based on the wave theory, but in terms of explaining energy, it also relies on the particle theory. These are two sides of light.

Light, of course, belongs to the concept of "matter" in the philosophical sense.

Lead is the strongest protection against radiation and is therefore lead. It shields from coffee rays.

In addition, paraffin wax can also be used.

Neutrons are also shielded with water.

Light is a wave-free duality.

That is, light is both a particle and a wave!

As long as it is a large enough substance, it can be blocked.

It is both an electromagnetic wave with a high frequency and a particle.

You can imagine a small segment of a wave (like an S-shaped snake) being emitted at high speed like a particle

Visible light can be observed with the eye, and invisible light can be measured and detected with optical instruments or photographic methods

If the light is fully reflected, it should be completely blocked

It is an electromagnetic wave, which has wave-particle duality, and the light flux is mainly particle-based; On the contrary, volatility is dominant.

We can only ask what matter can completely block visible light or a certain wavelength of light, and the light we usually talk about is visible light, which accounts for only a small part of the light wave.

The essence of light should be thought of as a "photon", which has wave-particle duality. So light is not only a wave, but also made up of photons.

Light is rays, "What matter can completely block light, probably opaque".

Light is a wave, black things and metals can block light.

There are two types of velocity: uncertain vibration velocity and unidirectional velocity 1When matter moves at the speed of light, the unidirectional velocity is the largest, and it can be seen from the facts that the condensed state of matter has the smallest vibration velocity.

2.Extrapolated by the energy balance At the moment of 0 of the big **, the temperature of the object is the highest, and the universe has been cooling down since then, and the uncertainty vibration is the strongest, then the one-way velocity must be the lowest, 0

The slowest you want to ask should be one of them.

Objects at rest are the slowest and also move the slowest.

Light has the fastest speed and the fastest movement of light particles.

No, so far no one has been able to argue that there is an object that moves faster than the speed of light. Someone once tried to imagine this: suppose that the speed of motion of object A relative to us is the speed of light, and then there is object B moving on object A along the direction of a with velocity v2, according to the theory of relativity, we can easily conclude that the speed of motion of object B relative to us is the speed of light + v2, then, isn't this speed more than the speed of light?

The answer is: no. I once saw a prawn at a physics forum use his argument to disprove this hypothesis, and the audience received a lot of applause.

I don't remember which forum, but I do remember vividly that his argument used a formula for speed at high speeds.

Recently, however, there has been a foreign view that in the field of advanced mathematics, space-time is regarded as a straight line, which can theoretically be bent. Spatial warping is used to compress the space, thereby distorting the space.

This makes the object speed faster than the speed of light. I don't know the specifics, hehe.

If I find that forum or formula and then tell you about it, leave your contact information.

Resources.

What object moves the least.

Light is the slowest object.

Light what objects move the fastest.

Light is what object is the fastest light.

The speed of the movement is relative.

But the fastest speed is the speed of light.

The speed of light is the speed limit of motion, and the speed limit tends to infinity.

There is no absolute motion, and there is no absolute stillness.

When the sun doesn't move, it is much faster or slower relative to its objects.

Slowest speeds? Does it have something to do with absolute zero? But the fastest speed is 299792458 meters per second.

Upstairs is not right, stillness and movement are two states, this is a problem, not a brain teaser.

This is a question of the "relativity of motion and rest".

So there must be a reference

You can always find something faster or slower than you say.

What object moves the fastest people!

He's built everything!

You don't even give me a reference to tell me what to do.

Known: s=240km v1=55km h v2=65km h: t meets s nanjing t hainan.

Solution: t=s t=240km (55+65)km h=2hsNanjing=65km h·2h=130km

tHainan=130km55kmh=

Answer: They set off for 2 hours to meet, the meeting place is 130km away from Nanjing, and then arrive in Nanjing by bus from Hai'an.

Forehead ......I don't know if it's right, let's make up the numbers...

Known: The distance between the two places is S=240km, V1=55km h, V2=65km h, and the two cars drive in opposite directions.

Q: How long did it take for them to meet after they left? (T1) How far is the meeting place from Nanjing? (s1) How long does it take for a bus from Hai'an to Nanjing? （ t2）

Solution: s=(v1+v2)*t1

t1=s = (v1+v2)=240 (55+65)=2 hours, s1=(65km h)*2h=130km.

240km (55km h) = hours.

t2 = hours.

A: They met 2 hours after departure. The meeting place is 130 kilometers away from Nanjing. After an hour, the bus departed from Hai'an to Nanjing.

It is known that the distance s=240km, v1=55km h, v2=65km h find t when they meet, the distance s2 from Nanjing, and the time when Hai'an's car arrives in NanjingT1 solution: according to the time of meeting, the travel of the two cars is exactly the distance from Nanjing to Hai'an, so v1*t+v2*t=240

The solution yields t=2 (hours).

The distance from Nanjing is the total distance, and the distance from Hai'an to the time of meeting is removed, so s-v1*t=s2

The solution yields s2=130 (km).

It is available according to the remaining distance and speed.

t1=s2 v1= (hours).

Answer: After departure, the two cars meet in 2 hours, the meeting place is 130 kilometers away from Nanjing, and after about an hour, the car from Hai'an arrives in Nanjing.

aGround distance at the beginning: m1g=kx1, find x1

aThe last distance from the ground: m2g=kx2, find x2

l=x1+x2 (==Add because the former is compressed and the latter is elongated).

As soon as B is about to leave the ground, the pull force on B is balanced by gravity.

mg = kl to get l = mg k

When the two objects are at rest, the pressure of the resultant external force of the spring is a, that is, the gravity mg, that is, the spring is compressed when it is at rest, and the compression distance is l1 kl1=mg l1=mg k

And because when lifting, the spring must be relieved of the force, so A moves upwards first, and because when B is just off the ground, the spring receives a net force of B, and the downward gravity of B, the spring elongates L2 L2=mg K

and because b is not moving relative to the ground.

So a moved l=l1+l2=2mg k

I still have hard work typing the most.

Magnesium strip is the "magnesium belt", silvery-white, solid at room temperature Do not touch the magnesium strip with your hands, when igniting, the magnesium strip should be clamped with crucible pliers (iron tongs), the burning magnesium strip emits a large amount of light, emits a lot of heat, and after combustion, the product (white powder magnesium oxide) can be placed on the asbestos net to observe. (Do not place it directly on the table to avoid contaminating the table!) Chemical formula] mg [valency] +2 Magnesium strips react with nitrogen to produce magnesium nitride 3mg+n2=mg3n2 (condition is ignition) Magnesium strips burn to consume oxygen and nitrogen [Chemical Equation 1]:

O2 + 2 mg = ignition = 2 mgo Magnesium strips react with dilute hydrochloric acid.

Magnesium strips can also produce reactions in hydrochloric acid, which is a chemical change, and the change is very fast, and the phenomenon is obvious [chemical formula equation 2]: mg+2HCl=mgCl2+H2 This is a violent chemical reaction of magnesium strips in hydrochloric acid, which will produce a lot of heat, which is an exothermic chemical change Pay attention to hot hands! [Alkali containing magnesium ions] Mg(OH)2 [Salts containing magnesium ions] Mg(NO3)2 mgCl2 mgSO4 mgCO3

Chasing girls should pay attention to methods, stalking, sweet words, relentless pursuit, and treat each other with sincerity, but first you have to find out a girl's personality so that you can more easily catch up, and it depends on how much you know about her in the early stage, and then prescribe the right medicine, step by step.

The first is that you have to be able to make jokes and tell jokes that she is interested in, such as in life or at work. Second, be very good at speaking. Thirdly, you can tease her from time to time, make her happy, and get her attention.

Fourth, if she is really interested in you, she will talk to you more and ask her out for dinner and movies. Secondly, it depends on the girl's personality. . .