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

[单选题]
By approximately how many powers of ten is th:7;b h7 hg9 */o euhbcusxwck, nk2n5de height of a human larger than th dy b(vw vs-x56rmf9yos u-*2he height of a grain of sambov9d w6 -rs2(*v y5hxyusf-nd?

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 mf9q7+0 /kctri e 2fwhdillimetre 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!