Light is also a wave waves are wavy , why does it travel in a straight line, not in a wave shaped w

It should be noted here that light has wave-particle duality, and the premise of the wave nature of light is that there is a sufficient quantity.

photons, such as light interference experiments, diffraction phenomena, etc. The particle nature of light is reflected in the fact that when a single photon is observed, the motion of the photon satisfies the uncertainty principle in quantum theory (which will not be described in detail here).

After having enough understanding of the diffraction experiment of light, we can know that the wave of light is different from the mechanical waves (such as water waves, etc.), which can be understood as the statistical results of the motion of photons (provided that a sufficient number of photons) change regularly under the action of changing electric and magnetic fields, that is, the light wave is a "probability wave", and the probability of photons appearing at any point in their trajectory satisfies a complex equation.

When we look at light from a macroscopic angle, we can think of it as propagating in a straight line, but when we look at it from a microscopic angle, the light does not travel strictly in a straight line (you can look at the experimental process of interference diffraction of light).

Wave-particle duality of light.

The uncertainty principle.

Interference of light. Diffraction of light.

In short, the process of understanding light reflects the development process of modern physics, and the essential characteristics of light are far more than the little knowledge involved in middle school physics. If you are interested in this area, I recommend checking out the introductory books on modern physics.

If light is a wave, any matter can be a wave, and when its wavelength is zero, it is a particle. In fact, any matter that persists is a medium, that is, the medium through which energy is transferred – that is, "ether". Ether is redundant.

Any continuous matter is itself an ether, including the gravitational field itself. The ontology of the universe, that is, what was before the universe, has been debated in the scientific community, and the more convincing one is the "big **" theory.

Let's go back to 13.8 billion years ago, when all matter in the universe started from the singularity, the later singularity, that is, when the current universe and everything came into being. In the early days of the history of the universe, the entire universe was in a state of high temperature. It will develop in a state of rapid expansion, and it will leave behind a substance called "glow".

Take light, for example. If light is continuous in space, like a puddle of water, it can act as a medium for waves, exhibiting the properties of waves.

If it's not continuous, it's only a particle. The particle characteristic of the double-slit observation experiment is that the "observation" itself blocks the continuity of the light cluster, so it appears particle-like. Compton proved that there is not only energy conversion but also momentum exchange between photons and electrons.

In 1923, de Broglie extended Einstein's wave-particle duality to microscopic particles, and proposed the material wave hypothesis, proving that microscopic particles also have waves. His views were quickly confirmed by experiments such as electron diffraction.

Particle duality is another leap in human understanding of the material world, laying the foundation for the development of wave dynamics. There is no "vacuum" in the world, only a "vacuum of solid particles". Even in the absence of solid particles, the energy field is continuous, and the solid matter field is not necessarily continuous.

As long as their spacing is small enough to propagate vibrations or fluctuations, it can be considered continuous). As long as there is a field, the wave can propagate, but the frequency is different. Light travels in a straight line in the same homogeneous medium.

Take the picture above as an example. Before entering the prism, the white light is in the same medium, so it travels in a straight line.

First of all, because the photon is too small and too small, it is impossible to test at the current level of technology. Therefore, it is only possible to judge by reasoning.

Fluctuation is a form in the process of energy propagation, such as water waves, which is a phenomenon formed by water molecules being dragged during the movement of force and changing the direction of motion.

In the case of photons, it is not known whether the mode of propagation is the transfer of energy or matter. To put it simply, just like the movement of a small ball, one situation is that the ball keeps moving forward, and the other situation is that after the ball in front collides with the next ball, the ball in front stops, and the ball behind it moves forward in relay.

If we understand the above ways of transferring energy, we should be able to understand that photon propagation should be a straight line propagation of energy, and fluctuation is just a special phenomenon when it encounters resistance, that is, even if it changes the direction of motion, it is actually the result of the component of straight line propagation after encountering resistance!

Light travels around in the form of electromagnetic waves, and because light itself has energy, it is always in motion and does not need other energy to help the light to continue moving.

In wave optics, light does not travel in a straight line because light is diffracted by the phenomenon. The essence of light is electromagnetic waves, so it is impossible for it to propagate in a straight line in the process of motion, but it needs to follow their laws.

Frequency vs. wavelength of light:

u f, where u is the speed of the wave and f is the frequency.

The process is as follows:

1) The wavelength is equal to the product of the wave velocity u and the period t, i.e. =ut.

2) The frequency f=1 t obtains: t=1 f. (This is the relationship between perimeter and frequency) 3) t=1 f is substituted for =ut, and =u f is obtained.

The units of u f: m, m s, hz respectively.

Wavelength vs. frequency:Frequency is the number of waves passing through a specified place at a fixed time, i.e., v=1 t. And the expression for wavelength is =ut, and the relationship between wavelength and frequency can be obtained as:

u/v。The unit of propagation velocity in the sub-relation is meter seconds, the unit of frequency f is hertz, and the unit of wavelength is meters.

Example: If a broadcasting frequency used in a broadcasting program is 639kHz (kilohertz), and the propagation speed of electromagnetic waves in the air is the speed of light three times ten to the eighth power of the nuclear thickness per second, then the wavelength of the radio wave of the program can be calculated = 300000000m s 639000hz=.

Aperture imaging is carried out using the principle of linear propagation of light.

Small hole imaging, a natural phenomenon, with a plate with small holes between the wall and the object, the wall will form an inverted image code key, we call such a phenomenon small hole imaging. When the middle plate is moved back and forth, the size of the image on the wall also changes, which illustrates the nature of light propagation in a straight line.

Straight line propagation of light:

Light travels in a straight line in the same homogeneous medium without being disturbed by gravity.

The sun gives human beings light and heat, which is an indispensable source of light for human beings. But due to the rotation of the earth, day and night are formed. Every night, darkness covers the land.

The ancestors of mankind, who lived in ancient times, were powerless against the night. Darkness gives people a terrible, hateful feeling. I don't know how many centuries it took for mankind to discover that fire can also provide light and heat.

At first, natural fire was used, and later artificial friction was invented to make fire. The invention of artificial friction for fire was an epochal advance in human history, which "for the first time enabled man to dominate a force of nature, thereby finally separating man from the animal kingdom".

Peking Man, who lived 500,000 years ago, already knew how to use natural fire, and about tens of thousands of years ago, humans learned to use the method of drilling wood to make fire artificially. Fire has been an artificial light source that people can use for a long time, and later people created oil lamps and candles, or they are inseparable, until the invention of modern light sources replaced fire.

Through long-term observation of light, it was discovered that the light that hits the ground along the gaps in the leaves of the dense forest forms ray-like beams, as does the daylight that enters the house through a small window. A large number of observational facts have led to the realization that light travels in a straight line.

In order to prove this property of light, about 24,500 years ago, Mo Zhai, an outstanding scientist in China, and his students conducted the world's first experiment on the inverted image of a small hole. Although he is not talking about imaging but about shadowing, the principle is the same.

The phenomenon of interference and diffraction is a phenomenon that Porter has, and light has these phenomena, which proves that light is a wave;

The polarization phenomenon Porter has a phenomenon, so it shows that light is a transverse wave, so the answer is: interference phenomenon, diffraction phenomenon; Polarization

Spherical. Sound waves are longitudinal waves, consisting of many concentric spheres that are densely intertwined, and the center of the sphere is the sound source.

It does not propagate in a straight line, but to every point on the outermost spherical "wavefront".

It is said to be a straight line because on the straight line between the source and the receiver, the complete dense longitudinal waves can be seen.

Moreover, when the sound wave encounters an obstacle, it can bypass the obstacle to a certain extent, that is, diffraction, so we can hear the sound behind the corner of the wall or outside the door. So in this sense, the sound wave propagation is not a straight line.

Answer] :d the diffraction phenomenon of light waves is shorter than that of sound waves, so the diffraction phenomenon of light waves is not as significant as that of sound waves.