Which of the following is NOT true?
A. Except for absorbance, most measurements contain significant figures and units.
B. All numbers should be recorded from a digital readout.
C. The uncertain digit is estimated between the last two markings.
D. If an average of 4 trials is being calculated the "4" is infinitely significant.
E. All of these are true.
Absorbance doesn't have units, and you should record all the numbers in a digital readout, so all of them are true.
E all of these are true
E all of these are true
To determine which of the given options is NOT true, we need to evaluate each option individually.
A. Except for absorbance, most measurements contain significant figures and units.
This statement is generally true. When measuring most physical quantities, such as length, time, temperature, etc., it is important to consider significant figures (the digits known with certainty) and include the appropriate units. Therefore, option A is likely true.
B. All numbers should be recorded from a digital readout.
This statement is not universally true. While digital readouts are often used to ensure higher precision and accuracy, they are not the only source of obtaining numbers. Measurements can be obtained from analog instruments as well, such as using a graduated cylinder, ruler, or thermometer. Therefore, option B is likely false.
C. The uncertain digit is estimated between the last two markings.
This statement is generally true. When making a measurement with an analog instrument, the uncertain digit is estimated between the last two markings. This helps account for the limitations of the instrument's precision. Therefore, option C is likely true.
D. If an average of 4 trials is being calculated, the "4" is infinitely significant.
This statement is false. When calculating the average of several trials, the number of trials itself (in this case, 4) is not considered a significant figure. Only the individual measurements used to calculate the average are significant. Therefore, option D is likely false.
E. All of these are true.
Since we have identified that option B and option D are likely false, option E cannot be true because it includes these options. Therefore, option E is likely false.
In conclusion, based on the explanations provided, the answer is that option B, "All numbers should be recorded from a digital readout," is NOT true.
A would be true EXCEPT for the except part. As far as I know, absorbance values have significant figures also.
B. I don't know that ALL numbers should be recorded.
C is true.
D is true.
E can't right if C and D the only true ones.