问题
选择题
下列常见盐在生产、生活中的用途不合理的是（ ）
A．用工业食盐腌制食品
B．用硫酸铜给游泳池内水消毒
C．用小苏打加工面点
D．用明矾作净水剂
答案
答案：A
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下列常见盐在生产、生活中的用途不合理的是（ ）
A．用工业食盐腌制食品
B．用硫酸铜给游泳池内水消毒
C．用小苏打加工面点
D．用明矾作净水剂
答案：A
| Awarded the Nobel Prize for physics in 1918, German physicist Max Planck is best remembered as the originator of the quantum theory. His work helped usher in a new era in theoretical physics and revolutionized the scientific community’s understanding of atomic and subatomic processes. Planck introduced an idea that led to the quantum theory, which became the foundation of twentieth century physics. In December 1900, Planck worked out an equation that described the distribution of radiation accurately over the range of low to high frequencies. He had developed a theory which depended on a model of matter that seemed very strange at the time. The model required the emission of electromagnetic radiation in small chunks or particles. These particles were later called quantums. The energy associated with each quantum is measured by multiplying the frequency of the radiation, v, by a universal constant, h. Thus, energy, or E, equals hv. The constant, h, is known as Planck’s constant. It is now recognized as one of the fundamental constants of the world. Planck announced his findings in 1900, but it was years before the full consequences of his revolutionary quantum theory were recognized. Throughout his life, Planck made significant contributions to optics, thermodynamics and statistical mechanics, physical chemistry, among other fields. |
The particles of electromagnetic radiation given off by matter are known as ______.
A．quantums
B．atoms
C．electrons
D．valences