the radius of an atom is about 10^-15 m and the radius of the observable universe is about 10^23 km. The ratio of these quantities is?
回答 (1)
2016-06-22 7:06 pm
✔ 最佳答案
(The radius of an atom) : (The radius of the observable universe)= (10⁻¹⁵ m) : (10²³ km)
= (10⁻¹⁵ m) : (10²³ × 1000 m)
= 10⁻¹⁵ : 10²⁶
= (10⁻¹⁵/10⁻¹⁵) : (10²⁶/10⁻¹⁵)
= 1 : 10⁴¹
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