Sound can go around the wall because of what phenomenon of sound waves

Select D.

The propagation of vibrations produced by sound emitters in air or other substances is called sound waves. Sound waves travel in all directions with the help of various mediums. Sound waves are usually longitudinal waves.

There are also transverse waves. The point where the sound wave goes vibrates near the equilibrium position along the direction of propagation, and the propagation of the sound wave is essentially the transfer of energy in the medium.

Sound waves are the propagating form of sound, and the object that emits the sound is called the sound source. A sound wave is a mechanical wave.

The space in which sound waves travel is called the sound field, which is generated by the vibration of the sound source. The frequency of sound waves that can be heard by the human ear is generally 20 Hz (Hertz).

to between 20kHz.

Sound waves can be understood as the propagation of small perturbations of a medium that deviates from the equilibrium state. This propagation process is only the transfer of energy and does not take place the transfer of mass. If the perturbation is small, the transmission of the sound wave satisfies the classical wave equation.

is a linear wave. If the disturbance is large, the linear acoustic wave equation is not satisfied, and the dispersion of the wave occurs.

and the generation of shock waves.

Sound begins with the vibrations of air particles, such as those produced by guitar strings, human vocal cords, or speaker paper cones. Together, these vibrations push neighboring air molecules while slightly increasing the air pressure. The air molecules under pressure then push the surrounding air molecules, which in turn push the next group of molecules, and so on.

When a high-pressure area passes through the air, it leaves a low-pressure area behind.

When these pressure wave changes reach the human ear, they vibrate the nerve endings in the ear, and we hear these vibrations as sounds.

The phenomenon of "the partition wall has ears" is because the wavelength of the sound wave is long, and it is easy to have obvious diffraction, that is, the sound wave continues to propagate around the obstacle, so d is correct, and a, b, and c are wrong

Therefore, choose D

If the sound comes from the vibration of the object and then travels through the air to this wave, this is a pair, because the sound is essentially energy propagating in the medium, which is similar to throwing stones in a pond and scattering the ripples.

What about when passing through a solid like a wall? Does a solid like a wall also shake? If so, what makes it vibrate?

This is because the walls can vibrate, and then they can make sounds. It is the energy of sound that makes it vibrate.

Also, the wavelength of the sound is longer and can go around the wall, so there is a partition wall and an ear.

In detail, look at college physics, junior high school physics, etc.

The phenomenon of "the partition wall has ears" is because the wavelength of the sound wave is long, and it is easy to have obvious diffraction, that is, the sound wave continues to propagate around the obstacle, so d is correct, and a, b, and c are wrong

Therefore, choose D

a. Speaking in an empty house, the sound is particularly loud, which is the reflection phenomenon of the sound Therefore, a error b. Walking around the tuning fork that is being pronounced, you can hear the sound of strong and weak, which is due to the distance difference of half a wavelength of the even times is the vibration strengthening, if it is an odd number of times, the vibration is weakened, and the interference result of the sound is so B is correct

c. The partition wall has ears because the wavelength of the sound wave is long and the diffraction phenomenon occurs, so C is correct D. Put the ear on the track to hear the distant train sound, because the sound runs in the steel more than 10 times faster than in the air, in addition, when the sound travels along the steel, it travels a long distance and does not weaken; However, when the sound travels in the air, it quickly becomes weak after a certain distance The sound runs fast and far in the steel, so when a person is standing, he cannot hear the sound of the train coming from the air, but he can hear it by sticking his ear to the railroad tracks, which belongs to the problem of the speed of propagation of sound waves in different media and the law of energy attenuation, so D is wrong

Therefore, BC was chosen

Answer] C Answer Analysis] Test Question Analysis: The wavelength of sound waves is long, and it is easy to diffraction to bypass obstacles, so C is correct.

Test Center: The diffraction of waves was examined.

Sound waves can travel around a building, and the sound is diffracted to indicate that the wavelength of the sound wave is longer Although the sound wave is a longitudinal wave, the phenomenon of bypassing an obstacle does not mean that the sound wave is a longitudinal wave

Therefore, c

c speaking in an empty house, and the sound is particularly loud, it is a reflection of sound waves, awrong; Walking around the center of the circle around the tuning fork being pronounced, you can hear the sound of flickering strength and weakness, which is an interference phenomenon, b error; If you put your ear to the railroad tracks, you can hear the sound of a train in the distance, it is the sound wave that travels faster in the solid than in the gas, d is wrong; In ancient times, the pan hanging in a monk's room often resonated with itself, which belonged to the resonance phenomenon of sound waves, and option C was correct.

a. Speaking in an empty house, the sound is particularly loud, which is the reflection phenomenon of the sound Therefore, a error b. Walking around the tuning fork that is being pronounced, you can hear the sound of flickering strength and weakness, which is due to the distance difference of half a wavelength of even times for vibration strengthening, if it is odd times for vibration weakening, the interference phenomenon of this sound B is wrong

c. In ancient times, the Pan hanging in a monk's room often resonated with itself, because the vibration frequency was equal to the natural frequency of the Pan itself, and the resonance phenomenon occurred, so C was correct

d. Put your ear on the track to hear the sound of the train in the distance, which belongs to the straight line propagation of sound waves, so D is wrong

Therefore, c