Chapter 33 Early Quantum Theory and Models of the atom 2. Blackbody(黑体) 能完全吸收照射到它上面的各种频率的电磁辐射的 物体称为黑体. a blackbody is a body that would absorb all the radiation falling on it. 黑体辐射与温度的关系口
Chapter 33 Early Quantum Theory and Models of the Atom 2. Blackbody (黑体) 能完全吸收照射到它上面的各种频率的电磁辐射的 物体称为黑体 .A blackbody is a body that would absorb all the radiation falling on it
Chapter 33 Early Quantum Theory and Models of the atom 任何物体(气、液、固)在任何温度下,都会有 热辐射,只是在不同的温度下所发出的各种电磁波的 能量按波长(频率)有不同的分布,所以才表现出各 种颜色。低温物体发出的是红外光,炽热物体发出的 是可见光,极高温物体发出的是紫外光 All objects emit electromagnetic radiation at any temperature. As the temperature increases, the electromagnetic radiation emitted by bodies is most intense at higher and higher frequencies. 实验表明辐射能力越强的物体,其吸收能力也越强 A good absorber is also a good emitter
Chapter 33 Early Quantum Theory and Models of the Atom 任何物体（气、液、固）在任何温度下，都会有 热辐射，只是在不同的温度下所发出的各种电磁波的 能量按波长（频率）有不同的分布，所以才表现出各 种颜色。低温物体发出的是红外光，炽热物体发出的 是可见光，极高温物体发出的是紫外光。 All objects emit electromagnetic radiation at any temperature. As the temperature increases, the electromagnetic radiation emitted by bodies is most intense at higher and higher frequencies. 实验表明 辐射能力越强的物体，其吸收能力也越强. A good absorber is also a good emitter
Chapter 33 Early Quantum Theory and Models of the atom Any heated solid or liquid, and even by dense gases, can continuously radiate electromagnetic wave which contains a continuous range of wavelength. 800K 1000K 1200K 1400K Shorter wavelength 例如:加热铁块,温度↑,铁块颜色由看不出发 光→暗红→橙色→>黄白色→蓝白色
Chapter 33 Early Quantum Theory and Models of the Atom 800K 1000K 1200K 1400K Shorter wavelength Any heated solid or liquid, and even by dense gases, can continuously radiate electromagnetic wave which contains a continuous range of wavelength. 例如：加热铁块，温度，铁块颜色由看不出发 光 → 暗红 → 橙色→ 黄白色→ 蓝白色
Chapter 33 Early Quantum Theory and Models of the atom 红外照相机拍摄的人的头部的热图 热的地方显白色,冷的地方显黑色
Chapter 33 Early Quantum Theory and Models of the Atom 红外照相机拍摄的人的头部的热图 热的地方显白色，冷的地方显黑色
Chapter 33 Early Quantum Theory and Models of the atom 个黑白花盘子的两张照片 室温下,反射光1100K,自身辐射光
Chapter 33 Early Quantum Theory and Models of the Atom 一个黑白花盘子的两张照片 室温下，反射光 1100K，自身辐射光