λ can be varied by using different colored LEDs/lasers (red, green, blue, etc) and using the values for λ given on these LEDs/lasers for any calculations/analysis. In the example question, two variables are involved in the experiment, λ (independent) and h (dependent). Describe the method to vary the independent variable, and a method to measure the effect on the dependent variable. Now that you have mentioned the variables, you need to describe how to measure them. While you do this, keep in mind one thing that there may be a lot of such quantities that need to be kept constant always mention that quantity which DIRECTLY affects the variables being measured. Mention ‘how’ you are going to make sure it does not change, and ‘why’ you think it should be kept constant. Any quantity which may vary your results, other than quantities involved in the experiment, must be kept constant. In simpler terms, the independent variable is the variable you are going to vary in the experiment, and the dependent variable is the variable you are going to measure in the experiment (pay attention to the words ‘vary’ and ‘measure’).Īfter the identification of variables, you are required to identify the quantities you are going to keep constant. Dependent variable: it is a variable whose value depends on that of another.Independent variable: it is a variable whose variation does not depend on that of another.Here you are required to identify the variables in the experiment:
The experiment described in this paper 5, question 1 : ( May/June 2018 Paper 5 Variant 2) is used as an example for an explanation of the above pointers in the sections that follow.
We’ll now describe these pointers one by one. While solving this question, keep these pointers in mind: Whatever you practically perform in your paper 3, you have to write it in this paper. If you have done a good amount of practical work during your A Levels, this question won’t be much of a concern for you (especially if you paid good attention to your paper 3 of Physics). This question of paper 5 tests your ability to plan experiments. Paper 5 is a written paper to test the practical skills that you acquired during your Cambridge International A Level course.
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