**Unformatted text preview: **12 Chapt. 1 Quantities, Units, Conversions, Measurement, Significant Figures, and Uncertainties 8. Find to order of magnitude the number of dandelion plants in the US at one time at about midsummer. You are NOT permitted to look up any numbers. You must estimate them from what you know already. There is no exactly right answer—well all right, there is an exaclty right answer, but the instructor doesn’t know what it is. You must justify the values you estimate. 001 qfull 01010 3 3 0 tough math: simple error propagation 9. Say you have two experimental values A and B , and these differ from the true values by unknown deviations δA and δB respectively. Of course, you don’t know what the deviations are, but you estimate their maximum absolute values to be a and b : i.e., | δA | ≤ a and | δB | ≤ b ideally. The a and b quantities are your estimated uncertainties or less correctly (but very commonly) your errors. We assume a << | A | and b << | B | : this is often the case especially in cooked-up intro...

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