Three tone stone

Three tone stone

Sanyin stone, also known as Sancai stone, refers to "heaven, earth and man". Sanyin stone is located on the axis road outside the huangqiongyu hall.

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General situation of sanyinshi

The first, second and third paving slabs from xumizuo are sanyinshi. Standing on the first stone slab and talking to the hall, you can hear an echo.

Standing on the second stone slab and talking to the hall, you can hear two echoes. Standing on the third stone slab and talking to the hall, you can hear three echoes. The third stone slab of Sanyin stone is also called "Tianwen ruorei stone". That is to say, if you stand on the third stone slab and speak to the hall, if the main hall is only open to the door of Sanyin stone, and there is no obstacle between the door and the shrine in the middle of the hall, you will hear a loud echo, as if "the world even talks, Tianwen ruorei".

Analysis of Sanyin stone

Have you ever been to Beijing? It is a beautiful city and the political, cultural and economic center of our country. There is a temple of Heaven Park. The temple of heaven is located in the north of the park. It is the place where ancient emperors held religious ceremonies. Its architecture is not only magnificent in appearance, but also has wonderful acoustic characteristics. For example, one of the steps leading to the imperial vault is called Sanyin stone. If you stand on this step and clap your hands, you can hear three or more consecutive claps. The stone used in this step is no different from ordinary stone, so why does it have such an effect? Do you know the secret?

appearance

The surrounding walls of the temple of heaven are very high, hard and smooth, which can reflect sound well; the walls are round, and the three tone stone is right in the center of the circle.

Acoustic characteristics

When you clap your hand, the sound spreads from the air to all sides. When you meet the wall, it is reflected back. The reflected sound passes through the three tone stone at the center of the circle. Therefore, when we clap our hands on the three tone stone, we will hear a clear echo, and the echo is very loud.

Another feature of the reflected sound is that it passes through the center of the circle and continues to move forward until it reaches the opposite wall. After a second reflection, it returns to sanyinshi. In this way, we can hear the sound for the second time, the third time, or even more times. Except for the sound when you clap your hands is the original sound, the rest are echoes.

Into the imperial vault, this is also a circular building.

If you stand in the middle and clap your hand, can you also hear the echo here? No! I just feel that the clapping is louder than in the wilderness. This is because the echo overlaps with the original and cannot be distinguished.

Physical explanation

It turns out that when the interval between sound production and echo is less than or equal to 1 / 10 second, we will listen to the two sounds as one sound, and the effect of echo only strengthens the original sound. The speed of sound in the air is more than 340 meters per second. Only when the distance between the human and the wall is more than 17 meters, the distance between the sound and the back will be more than 34 meters (340 △ 10 = 34). At this time, our ears can distinguish the echo. The inner radius of the imperial vault is only a few meters. Of course, there is no echo. The distance between sanyinshi and the wall is 32.5 meters. It is not difficult to calculate that the time interval between sound and echo will be 1 / 5 second, so clear echo can be heard.

In our daily life, we can also see a phenomenon of one knock and three rings. Find a classmate to knock on one end of a long enough water pipe, and you may hear three knocks on the other end. However, this is not an echo, but because sound travels at different speeds in air, water and iron pipes. Sound travels at 5200 M / s in iron, 1500 m / s in water and 340 m / s in air (15 ℃).

Address: Echo Wall, Tiantan Park, No.7, Dongli, inner Tiantan, Dongcheng District, Beijing

Longitude: 116.412943

Latitude: 39.878146

Ticket information: market price: 20.0 yuan