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Q. Conclude a rough "scale factor" or "plate scale." Measure the distances in mm or cm between each of the marked wavelengths and average the results.

Q. In an online survey, people were asked if they would cheat on their partner if there was no chance of getting caught. In the order of 23,000 internet users responded to the survey. Almost half of those responding said they would not, whilst the other half said they probably would. What is a significant limitation with surveys like this one?

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