Your lab report should probably be based around one or two central research questions (RQs). To start off with, caste a wide net and generate at least half a dozen possible RQs. You may want to write down all the variables in the study.
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Two characteristics, amplitude and frequency (see Fig. 2), mark the difference between AM and FM radio. AM stands for amplitude modulation, which means the amplitude of the radio signal is used to encode information. FM denotes frequency modulation, which uses a change in frequency to encode information. From this you can see that both AM and FM radio use modulation to encode information.