Mary smith obtained a density of 2.226g/ml for a metal sample. Using a different method, Joseph Henry obtained a value of 2.335g/mL for the same metal sample. Which student’s value is more accurate? Use the definition of accuracy to explain your answer. the true value is 2.300g/ml.

Joseph Henry.

Explanation:

Hello,

In this case, we define the accuracy based on the degree of deviation a measure has regarding the the true or expected value. In this case, the lower the difference, the more accurate the procedure. In such a way, for the two students, we compute the difference between the expected value and the obtained value:

In such a way, since the difference is lower in Joseph's measure, we can say he is the most accurate.

Best regards.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.