Incandescent light is produced when hot matter releases a portion of its thermal vibration energy asphotons. At about 1,472 degrees Fahrenheit (800 degrees Celsius), the energy radiated by an object reaches the infrared. As the temperature increases, the energy moves into the visible spectrum and...
, "light" means ___. A. the opposite of heavy B. a form of energy that makes things visible 相关知识点: 试题来源: 解析 A。在“The box is so light that I can carry it easily.”中,“light”表示“轻的”,与“heavy(重的)”相对。反馈 收藏 ...
A. Violet B. Red C. Green D. Yellow 相关知识点: 试题来源: 解析 A。解析:根据光子能量公式E = hf(E是能量,h是普朗克常量,f是频率),在可见光中,频率越高能量越高。紫光的频率最高,所以紫光的能量最高。红光频率最低,能量也低。绿和黄的频率和能量都低于紫光,所以答案为A。反馈...
Light is a form of electromagnetic irradiation whose energy causes responses in natural biological systems. Prominent examples are the photosynthesis in green plants, algae and some specific bacteria, in which the light energy is converted into chemical energy stored in organic compounds, or the synthe...
aenergy depend on the frequency. For example, visible light has a frequency between 能量取决于频率。 例如,可见光有一个频率之间[translate]
High Energy Visible Light (HEVIS Light) is all around us. It’spart of the light we can see.It’s been around for as long as UV rays, but while much has been written about their effect on skin, the molecular and visible effect of HEV Light on skin is a more recent discovery. Resea...
A. To show how astronauts are protected from UV rays. 展示宇航员如何免受紫外线的伤害。B. To introduce the first human who walked on the moon. 介绍第一个在月球上行走的人。C. To describe the new technology used in space. 描述太空中使用的新技术。D. To show how we protect ourselves from...
Kiki… 有许多事学会… 她在哪里将有时间?[translate] aLong-wave radiation energy is a form of heat while short wave radiation energy is visible light from the sun 当短波辐射能量是可见光从太阳时,长挥动辐射能量是热的形式[translate]
Like visible light,UV rays are energy waves released by the sun,only they cannot been seen. Some exposure (暴露) to those waves can do a body good. For example, ultraviolet B(UV-B)rays tell human skin to make vitamin D. Too much exposure can be harmful, though. Overexposure to UV ra...