threshold frequency

简明释义

监界频率

英英释义

例句

1.The threshold frequency 阈频 is essential in determining the minimum energy required for electron emission.

了解阈频对于确定电子发射所需的最小能量至关重要。

2.To observe the emission of electrons, the light must have a frequency greater than the threshold frequency 阈频 of the metal.

要观察电子的发射，光的频率必须大于金属的阈频。

3.The photoelectric effect occurs only when the incident light frequency exceeds the threshold frequency 阈频.

光电效应仅在入射光频率超过阈频时发生。

4.In experiments, we measured the threshold frequency 阈频 of various metals to understand their conductivity.

在实验中，我们测量了各种金属的阈频以了解它们的导电性。

5.Each material has its own unique threshold frequency 阈频 that determines its photoelectric properties.

每种材料都有其独特的阈频，决定其光电特性。

作文

In the realm of physics, particularly in the study of photoelectric effect, the concept of threshold frequency plays a crucial role. The threshold frequency is defined as the minimum frequency of incident light that is required to eject electrons from a material's surface. This phenomenon was first thoroughly investigated by Albert Einstein, who proposed that light can be thought of as being made up of particles called photons. Each photon carries a specific amount of energy, which is directly proportional to its frequency. Therefore, if the frequency of the incoming light is below the threshold frequency, no electrons will be emitted, regardless of the intensity of the light. This principle highlights the particle-like behavior of light and its interaction with matter.The significance of the threshold frequency can be illustrated through a simple analogy. Imagine trying to push a heavy object over a hill. If you do not apply enough force, the object will remain stationary. However, once your force exceeds a certain level, the object will roll down the hill effortlessly. In this analogy, the force represents the energy of the incoming photons, while the hill represents the energy barrier that the electrons must overcome to escape from the material. The threshold frequency is akin to the minimum force needed to get the object moving.Different materials have different threshold frequencies, which depend on the work function of the material—the minimum energy needed to remove an electron from the surface. Metals typically have lower threshold frequencies because they possess loosely bound electrons, whereas insulators have higher threshold frequencies due to their tightly bound electrons. This variability is crucial in applications such as photodetectors and solar cells, where understanding the threshold frequency allows engineers and scientists to choose appropriate materials for specific applications.Moreover, the threshold frequency has profound implications in the field of quantum mechanics. It underscores the quantized nature of energy levels within atoms and the discrete interactions between photons and electrons. When light shines on a material, only photons with energy greater than or equal to the work function can liberate electrons. This relationship is not only foundational in understanding the photoelectric effect but also serves as a gateway to more advanced topics in quantum physics, such as the development of lasers and various forms of spectroscopy.In conclusion, the threshold frequency is a fundamental concept in understanding the interaction between light and matter. Its implications stretch across various fields of science and technology, influencing everything from the design of electronic devices to our theoretical understanding of quantum mechanics. By grasping the importance of the threshold frequency, we can better appreciate the intricate dance between photons and electrons that governs much of the physical world around us. As we continue to explore these phenomena, the mysteries of light and its interaction with matter will undoubtedly lead to new discoveries and innovations in the future.

在物理学的领域，特别是在光电效应的研究中，阈频率的概念起着至关重要的作用。阈频率被定义为从材料表面弹出电子所需的入射光的最小频率。这种现象首次由阿尔伯特·爱因斯坦进行了深入研究，他提出光可以被视为由称为光子的粒子组成。每个光子携带特定量的能量，这与其频率成正比。因此，如果入射光的频率低于阈频率，则无论光的强度如何，都不会发射电子。这个原理突显了光的粒子行为及其与物质的相互作用。阈频率的重要性可以通过一个简单的类比来说明。想象一下试图将一个重物推过一个山丘。如果你没有施加足够的力量，物体将保持静止。然而，一旦你的力量超过某个水平，物体将毫不费力地滚下山坡。在这个类比中，力量代表入射光子的能量，而山丘代表电子必须克服的能量障碍。阈频率类似于使物体开始移动所需的最小力量。不同材料具有不同的阈频率，这取决于材料的功函数——从表面移除电子所需的最小能量。金属通常具有较低的阈频率，因为它们拥有松散结合的电子，而绝缘体由于其紧密结合的电子而具有较高的阈频率。这种可变性在光电探测器和太阳能电池等应用中至关重要，了解阈频率使工程师和科学家能够选择适合特定应用的材料。此外，阈频率在量子力学领域具有深远的影响。它强调了原子内能级的量子化特性以及光子与电子之间的离散相互作用。当光照射到材料上时，只有能量大于或等于功函数的光子才能释放电子。这种关系不仅是理解光电效应的基础，而且也是通向量子物理更高级主题的门户，例如激光的发展和各种形式的光谱学。总之，阈频率是理解光与物质相互作用的基本概念。其影响跨越科学和技术的各个领域，影响从电子设备设计到我们对量子力学的理论理解。通过掌握阈频率的重要性，我们可以更好地欣赏支配我们周围物理世界的光子与电子之间微妙的舞蹈。随着我们继续探索这些现象，光及其与物质相互作用的奥秘无疑会在未来带来新的发现和创新。