试题与答案

德国科学家贝塞尔推算出天鹅座第61颗暗星距离地球102 000 000 000

题型:解答题

题目:

德国科学家贝塞尔推算出天鹅座第61颗暗星距离地球102 000 000 000 000千米.

(1)用科学记数法表示出暗星到地球的距离;

(2)如果光线每秒大约可行300 000千米,那么你能计算出从暗星发出的光线到达地球需要多少秒吗?用科学记数法表示出来.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, B, C, D

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