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 mv,e 61ejhro *xany powers of ten is the height of)+gw/sur xvh-z v 1ca7 a human larger than the height of + r1hucs)xv w/-7va gza grain of sand?
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 tttpg6 *d)io0 gbpcbt.a6 km1p hqp65w 2*+tu millimetre long while human beings are about $2 \mathrm{~m}$ 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!
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Post time 2024-8-21 21:17:15