absolute black body

简明释义

绝对黑伐;

英英释义

例句

1.An absolute black body does not reflect any radiation, making it an ideal model.

绝对黑体不反射任何辐射，使其成为理想模型。

2.The concept of an absolute black body helps scientists understand the laws of blackbody radiation.

绝对黑体的概念帮助科学家理解黑体辐射的定律。

3.A theoretical absolute black body emits radiation at all wavelengths.

一个理论上的绝对黑体在所有波长上发射辐射。

4.In thermodynamics, an absolute black body is a perfect emitter and absorber of radiation.

在热力学中，绝对黑体是辐射的完美发射体和吸收体。

5.The temperature of an absolute black body can be measured by its emitted radiation.

可以通过其发射的辐射来测量绝对黑体的温度。

作文

In the field of physics, the concept of an absolute black body (绝对黑体) is fundamental to our understanding of thermal radiation. An absolute black body is an idealized physical object that perfectly absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. This means that it does not reflect or transmit any light, making it appear completely black to the human eye. The significance of such a body lies in its ability to serve as a perfect emitter of thermal radiation, described by Planck's law. The study of absolute black bodies is crucial when examining the laws of thermodynamics and quantum mechanics. According to the Stefan-Boltzmann law, the total energy radiated per unit surface area of an absolute black body is directly proportional to the fourth power of its absolute temperature. This relationship is pivotal in understanding how objects emit heat and light, which has numerous applications in both theoretical and applied physics.One of the most famous experiments related to absolute black bodies was conducted by Max Planck in the early 20th century. His work on black-body radiation led to the development of quantum theory, which revolutionized our understanding of atomic and subatomic processes. Planck proposed that energy is quantized and can only be emitted or absorbed in discrete amounts called quanta. This groundbreaking idea was a significant departure from classical physics, where energy was thought to be continuous.In practical terms, while no material can achieve the status of a true absolute black body, certain materials come remarkably close. For instance, carbon black is often used in experiments due to its high absorption rates across various wavelengths. Additionally, a cavity with a small hole can approximate an absolute black body; light entering the cavity is absorbed multiple times by the walls, minimizing reflection. This principle is utilized in devices like black-body radiation calibrators, which are essential for accurate temperature measurements in scientific research.Understanding the properties of an absolute black body also has implications in astrophysics. Stars, including our Sun, can be approximated as black bodies, allowing scientists to determine their temperatures and luminosities based on the spectrum of light they emit. By analyzing the radiation emitted by these celestial bodies, researchers can gain insights into their composition, age, and distance from Earth.In conclusion, the concept of an absolute black body (绝对黑体) is not just a theoretical construct but a vital part of the scientific framework that governs thermal radiation and quantum mechanics. Its implications extend beyond simple physics to areas such as engineering, astronomy, and environmental science. As we continue to explore the universe and the fundamental laws of nature, the understanding of absolute black bodies will remain a cornerstone in the quest for knowledge in the physical sciences.

在物理学领域，绝对黑体的概念对我们理解热辐射至关重要。绝对黑体是一个理想化的物理对象，它完美吸收所有入射的电磁辐射，无论频率或入射角。这意味着它不会反射或透射任何光，使其在肉眼看来完全是黑色的。这种物体的重要性在于它作为热辐射的完美发射体，依据普朗克定律进行描述。研究绝对黑体对于考察热力学和量子力学的定律至关重要。根据斯特藩-玻尔兹曼定律，单位表面积上辐射的总能量与其绝对温度的四次方成正比。这一关系对于理解物体如何发出热量和光线至关重要，这在理论和应用物理中都有着广泛的应用。与绝对黑体相关的最著名的实验之一是马克斯·普朗克在20世纪初进行的。他对黑体辐射的研究导致了量子理论的发展，这一理论彻底改变了我们对原子和亚原子过程的理解。普朗克提出，能量是量子化的，只能以称为量子的离散量形式被发射或吸收。这一突破性的思想与经典物理学形成了鲜明对比，后者认为能量是连续的。在实际应用中，虽然没有材料能够达到真正的绝对黑体的状态，但某些材料非常接近。例如，碳黑由于其在各种波长下的高吸收率而常用于实验。此外，带有小孔的腔体可以近似为绝对黑体；进入腔体的光线会多次被墙壁吸收，从而最小化反射。这个原理被用于黑体辐射校准器等设备，这对于科学研究中的准确温度测量至关重要。理解绝对黑体的特性在天体物理学中也具有重要意义。包括我们的太阳在内的恒星可以被近似为黑体，使科学家能够根据它们发出的光谱确定其温度和光度。通过分析这些天体发出的辐射，研究人员可以深入了解它们的组成、年龄和与地球的距离。总之，绝对黑体（绝对黑体）的概念不仅仅是一个理论构造，而是支配热辐射和量子力学的科学框架中的一个重要组成部分。它的影响超越了简单的物理学，扩展到工程学、天文学和环境科学等领域。在我们继续探索宇宙和自然基本法则的过程中，理解绝对黑体将始终是物理科学知识追求的基石。