I am a freshman and love physics. This is a cooperative paper. Please open it yourself.

I have been writing for four hours, but it's not the best idea for me, is it?

Paper: On the Similarities and Differences between Sound Wave and Electromagnetic Wave 20 1 1 February 15 Classification: Personal Diary

When it comes to waves, we will definitely think of two most common waves: sound waves and light waves (electromagnetic waves). Many people confuse the two, which is wrong.

Generally speaking, sound waves are used for listening and electromagnetic waves are used for seeing. Of course, this is somewhat unscientific. Strictly speaking, sound waves propagate through a medium, while electromagnetic waves propagate through a "field", which can be either an electric field or a magnetic field.

Sound waves are caused by the vibration of objects. If there is a medium around an object, the vibration will be transmitted to the medium, and then from the medium to other objects. In other words, energy is transferred with vibration. Sound wave is a kind of mechanical wave, which has the characteristics of mechanical wave. Sound waves are divided into shear waves and longitudinal waves.

The nature of electromagnetic wave is much more complicated than sound wave, and the change of electric field or magnetic field will cause electromagnetic wave. We know that when the circuit state changes, it will cause the change of magnetic field, and the conductor in the changing magnetic field will be charged. At this time, the electric field is also changing, and the changing magnetic field will produce a changing magnetic field. In other words, the energy of electromagnetic waves propagates alternately in the form of electricity and magnetism, and the changing electric field will produce a magnetic field. According to Maxwell's electromagnetic theory, the changing electric field and the changing magnetic field are an inseparable unity, that is, electromagnetic field. The changing electric field and the changing magnetic field are always alternately generated and spread from the generated area to the surrounding space, which is electromagnetic wave. Electromagnetic wave propagates in the space without medium, which is a kind of shear wave and transmits the energy of electromagnetic field. The most common electromagnetic wave is visible light. There are two earliest theories about light: Huygens' wave theory and Newton's particle theory. Huygens believes that light is a kind of wave, which is produced by luminous body and propagates through the medium like sound wave. This theory was not widely recognized until19th century discovered the interference and diffraction of light, while Newton thought that light is a particle emitted by a light source, which travels in a straight line from the light source to the illuminated object, so it can be imagined as a light beam emitted by a luminous body. This theory directly explains the linear propagation, reflection and refraction of light. It was not until the discovery of optical interference in19th century that it was generally accepted and was overthrown by wave theory. However, at the beginning of 19 century and the beginning of 20 century, many phenomena of the interaction between light and matter, such as photoelectric effect, could not be explained by wave theory, which prompted Einstein to put forward that light is a kind of light in 1905.

Sound waves and electromagnetic waves 1 can be reflected and refracted; 2. Diffraction phenomenon (the phenomenon that waves continue to propagate around obstacles); 3. Both can be superimposed (when several waves meet, each wave can keep its original propagation direction and continue to propagate without interference, but in the overlapping area, the total displacement of any particle is equal to the vector sum of the displacements caused by each wave); 4. There is interference (the superposition of two waves with the same frequency strengthens the vibration of some areas and weakens the vibration of some areas, and the phenomenon that the areas where the vibration is strengthened and weakened are separated from each other is called wave interference); 5, all have the Doppler effect (due to the relative motion between the wave source and the observer, the observer feels that the frequency of the wave has changed, which is called the Doppler effect. For example, an ambulance whistles in front of you, and you will find that the tone is different when the car is close to you and when the car is far away from you. Another big difference between sound waves and electromagnetic waves is that the speed of electromagnetic waves is much faster than sound waves.

Abdominal snowstorm: my first paper. Please give me your advice. Thank you.