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我们先来分析下这15分是如何分布的。
1.How to define the problem,3分。
2.Methods of data collection,5分。
3.Method analyze,2分。
4.Safety considerations,1分。
5.Additional parts,4分。
因此我们只需要抓住采分点,按分答题即可得到这15分。
在how to define the problem中,这3分分别对应定义中的independent variable,dependent variable以及如何控制其他变量。
Methods of data collection则跟具体题目有关,对于能得分的点是:label diagram,表明如何测量自变量,表明因变量如何测量,重复进行实验,采用取平均值的方法来获取所需数值,以及如何才能得到实验需要的值。
第四部分:Safety considerations的1分也与具体实验内容有关,一般用“precaution linked to…”来回答。最后的Additional detail则更为开放,可对测量方法进行补充(可以思考实验的不足之处),也可以对安全问题进行补充,并且数据分析这块的补充肯定是“Relationship is valid if the graph is a straight line passing through the origin or having a y-intercept”.
An alternating potential difference is applied to the vibrator.For a given peak,there is a maximum frequency at which the small mass remains in contact with the plate.The contact between the small mass and plate is lost when the frequency is greater than"f".
It is suggested that the relationship between and is
k=π²f²V
where"k"is a constant.
Design a laboratory experiment to test the relationship between"f"and"v".
首先我们先完成how to define the problem的3分:
"V"is the independent variable;
"f"is the dependent variable;
keep the position of the mass constant.
其次完成Methods of data collection的5个点:
labelled diagram showing signal generator connected to vibrator with two wires with mass on plate;
voltmeter connected in parallel with vibrator in a workable circuit;
measure"f"from signal generator;
detail regarding mass leaving the plate;
repeat each experiment for the same value of"V".
Method of analysis的2分较为简单。
plot a graph off²against1/V;
k=gradient*π²
关于Safety我们可以指出:precaution linked to mass leaving vibrating plate.
最后我们补充4点内容作为Additional detail。
先写上万能句:relationship is valid if the graph is a straight line passing through the origin;
wait for vibrator to oscillate evenly;
method to determine period of oscillation from c.r.o;
clean surfaces of metal plate.
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