【摘 要】
：
人教版物理八年级上册第二章第一节“声音的产生与传播”里的真空不能传声实验存在一些不足:抽气泵噪音大、笨重,操作不方便;抽气盘的密封效果不好;不能快速而连续地演示实验
【机 构】
：
内蒙古赤峰市阿鲁科尔沁旗教研室,内蒙古赤峰市阿鲁科尔沁旗天山四中,
论文部分内容阅读
人教版物理八年级上册第二章第一节“声音的产生与传播”里的真空不能传声实验存在一些不足:抽气泵噪音大、笨重,操作不方便;抽气盘的密封效果不好;不能快速而连续地演示实验,所用时间过长。为此,笔者做了如下改进。一、实验器材两个最大的相同拔罐器罐体、抽气枪、小音箱或手机、包装用的可折叠泡沫塑料、凡士林油。
People PEP Physics eighth grade second chapter first chapter “sound generation and transmission ” in the vacuum can not pass sound experiment there are some deficiencies: suction pump noise, bulky, inconvenient to operate; suction plate sealing effect Not good; can not quickly and continuously demonstrate the experiment, the use of time is too long. To this end, I made the following improvements. First, the two largest experimental equipment, the same cupping tank, suction gun, small speakers or cell phones, packaging, folding foam, Vaseline oil.
其他文献
We introduce a feedback mechanism to study the spreading of an epidemic by analytical methods and large scale simulations in exponential networks. It is found t
说起实验,人们马上就会想到“物理实验”、“化学实验”、“生物实验”.然而,一说到数学实验,人们立即都会表现出茫然和困惑.在大多数人的印象中,数学是一门纯理论的科学,抽
Most epidemic models for the spread of diseases in contact networks take the assumption of the infected probability of a susceptible agent dependent on its abso
正交和反交是两个相对的概念,表现型为不同的两种个体甲和乙杂交。如果将甲作父本,乙作母本定为正交,那么以乙作父本,甲作母本则定为反交。其中,甲是显性性状,乙是隐性性状。
The SABER/TIMED temperatures taken in 2002-2006 are used to delineate the tidal signals in the middle and upper atmosphere. Then the Hough mode decomposition is
We analytically discuss the nonclassical behaviour for a disturbed non-degenerated parameter amplifier.The thermal Glauber-Sudarshan diagonal presentation (GSP)
We report the single-to-multiple channel wavelength conversions of 1.57-ps pulses based on cascaded secondharmonic generation and difference frequency generatio
The dynamical process in the superheavy nucleus synthesis is studied on the basis of the two-dimensional Smolu-chowski equation. Special attention is paid to th
A 16 × 16 thermo-optic waveguide switch matrix has been designed and fabricated on silicon-on-insulator wafer.For reducing device length, blocking switch matri
笔者现对苏教版初中生物教材的3个实验进行改进,以提高生物实验教学的有效性。一、观察人的口腔上皮细胞实验教材提示取口腔上皮细胞的部位是在口腔内侧壁上轻轻刮一下,制成