Kognity IB Physics A.0 Measurements & Uncertainty (id: 92f2eca62)

[单选题]
By averaging three me2fb.k/dm0f br c:h zz2asurements of then)j3 z r+f)eanzd3y568. ykrpvra6zp same quantity which of the following can be y+3y r j )nz6.naa)r63ezd pkzrf85 pvreduced?

A. Random errors
B. Systematic errors
C. Random & systematic errors
D. Zero errors


参考答案:  A


本题详细解析:
Systematic errors arise dueilu qi7xj( r(,/8oeqwlrbt3 4 to faulty instrumentation or consistently bad technique. Averaging repeated measurements will not change a systematic bias. So B & C are uort 7i/ le(qr,x4lb3w(8jiqincorrect. Zero errors are examples of systematic errors, where a the zero of an instrument is not correctly calibrated. So D is incorrect. Random errors will be sometimes too high and at other times too low – so averaging them will have the effect of reducing the random error. Hence A is correct.