学习日记(foundation-chemistry)
c hapter5:Atomic Structure and the Periodic Table Different Theories of the Atom Classical View of the Universe Since the time of the ancient Greeks, the stuff of the physical universe has been classified as either matter or energy. -Matter:所有东西都有重量和体积 -Energy:不可分解的分子,但可以通过waves里面流动 The Nature of Light—Its Wave Nature -Light 是从electromagnetic radiation产生的 -Electromagnetic radiation 是通过waves产生的; traveling at a velocity “c” -Electromagnetic radiation 通过waves来移动然后通过pond的surface -wave有4个点,来确认他们的特点 。wave speed, 。height (amplitude), 。length, 。number of wave peaks that pass in a given time. -所有的electromagnetic waves会移动穿过空间在同样的,固定的速度 。3.00 x 10^8 meters per second in a vacuum = speedof light, c. Characterizing Waves -amplitude=wave的高度 。是从node到crest的距离 。是来测量intense of the light -amplitude越大,light越亮 -wavelength(λ)=测量wave cover的距离 。是2个crest之间的距离 。是个完整的cycle2π 。通常用nanometers来测量,1 nm = 1 x 10-9 m -frequency(ν)=waves通过一段时间(period)的数量 。The number of waves = number of cycles. 。Units are hertz (Hz), o