What are sources of particulate matter? A. All particles found in the air. B. Various kinds of burning activities. C. All types of human activities. D. Reaction of sunlight and water vapor. 相关知识点: 试题来源: 解析 B[解析] 颗粒物的来源是什么?文章第四段一开始就清楚地介绍了颗粒物的...
is composed ofverysmallparticlescalledmolecules.各种物质,不论它是什么,都是由一些称为分子的很小的粒子构成的。 相关知识点: 试题来源: 解析 考查动词短语。句意:每一种物质,无论是什么,都是由非常小的粒子组成的。根据句意和所给词可知,这里应选composed,be composed of 表示"由…组成",为动词短语。故填...
Matter is composed of positively charged particles called protons, neutral ones, called neutrons, and negatively charged particles called electrons.Answer and Explanation: Antimatter particles the opposite of matter particles, and are subsequently formed out of counterparts of protons, neutrons, and electro...
C. They may produce gamma rays or other high-energy particles. D. They may produce heat. 相关知识点: 试题来源: 解析 C。解析:“For example, when two dark matter particles collide, they may produce gamma rays or other high-energy particles.”,两个暗物质粒子碰撞可能会产生伽马射线或其他高能...
One of the dangers of particulate matter, especially the fine type, is that it can be inhaled. If the particles, which can be composed of any combination of hundreds of chemicals and elements, are able to get through the defenses of the nose and mouth, then they can find their way into...
From least to greatest in size, the particles of matter are generally arranged as follows: quarks, electrons, neutrons and protons (nucleons), atoms, molecules, and finally, macroscopic substances. This answer is: 👍👎Add a Comment Add your answer: Earn +20 pts Q: What is a list of ...
What is the largest object detectable by synchrotron radiation? Who proposed that matter is made of particles? What materials can magnetism pass through? What two discoveries confirmed the existence of electromagnetic waves? What was the first evidence of dark matter?
Matter explained: Atoms, molecules, elements and compounds Fundamentally, matter is composed of elementary particles calledquarksandleptons, both of which are considered elementary particles in that they aren't made up of smaller units of matter. Quarks -- groups ofsubatomic particlesthat interact by...
Particulate matter (PM) is made up of tiny pieces of solid or liquid in the air including dust, dirt, soot and smoke, according to the Centers for Disease Control and Prevention. Inhaled particles are typically categorized into two groups: PM10 and PM2.5 - the number representing the...
Particulate matter, or PM, isn’t just one contaminant or pollutant. It’s a range of particles of dust, dirt, and liquids that become suspended in the air.