Question

You measure the mass of a 500 g standard on your balance four times. You get values of 455 g, 456 g, 454 g, and 455 g. Which of the following best describes your balance?

Answers

Damon
We can not see your list. I would say wrong :)
alex
sorry.
not precise and not very accurate

not precise but very accurate

precise and accurate

precise but not very accurate (i think its this one)
Damon
precise but not very accurate (i think its this one)

yes, values close together but wrong
alex
Precision refers to the closeness of two or more measurements to each other...
Accuracy refers to the closeness of a measured value to a standard or known value....
So would it be precise and accurate?
Damon
it is precise
it is NOT accurate
455 is NOT 500
alex
ok.. thanks c:
alex
Calculate the wavelength (in m) of a photon capable of exciting an electron in Li2+ from the state n= 3 to the state n=5

1.4239*10^-7 - correct

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