GWD 1-23

[nana]

Q23:
The age of the Earth is approximately 1.3 1017 seconds, and one year is approximately 3.2 107 seconds. Which of the following is closest to the age of the Earth in years?

A. 2.5* 10^9
B. 4.1* 10^9
C. 1.9 * 10^10
D. 2.5 * 10^11
E. 4.1* 10^11

答案是B

題意看不太懂更是無從下手... :-$

[homaru]

The age of the Earth is approximately 1.3*10[sup]17[/sup] seconds, and one year is approximately 3.2*10[sup]7[/sup] seconds. Which of the following is closest to the age of the Earth in years?

地球的年齡是1.3*10[sup]17[/sup]秒
一年相當於3.2*10[sup]7[/sup]秒
問地球年齡幾年

(1.3*10[sup]17[/sup])/(3.2*10[sup]7[/sup])
=(1.3/3.2)*10[sup]10[/sup]
=0.40625*10[sup]10[/sup]
=4.0625*10[sup]9[/sup]

[nana]

ㄜ...問題好像還蠻簡單的
不知道當時怎麼會轉不過來
多謝蛋蛋大哥有教無類 (Y)