Kognity IB Physics A.0 Measurements & Uncertainty (id: 43662a57a)

admin

本题目来源于试卷: Kognity IB Physics A.0 Measurements & Uncertainty，类别为 IBDP Physics

[单选题]
By approximately how manymm;e knx xa+p1l,61sh powers ok ht;p-if-bgsfbex 8j/i1 ;a0f ten is the height of a human larger than the height of a grain of sand?bgjtps k 0ai;1f--f;e i b/x8h

A. -3
B. 2
C. 3
D. 1000


参考答案:  C


本题详细解析:
A grain of sand is about a 1-3 millimetre long while human beings are aboutgc0o fh g43gumwj* :r,i8)whv $2 \mathrm{~m}$ tall (very roughly!). So: $\frac{\text { height of human }}{\text { size of a grain of sand }}=\frac{2 \mathrm{~m}}{0.002 \mathrm{~m}} \approx 1000$ So we are about $1000=10^3$ times taller than a grain of sand. If you chose #2, this answer implies that a human is $10^{1000}$ times bigger than a grain of sand. This is a huge number!