Answer:
4
Explanation:
the zeros after 102,4 are not significant.
Answer:
0.13 s
Explanation:
We'll begin by converting 24900 mile to metres (m). This can be obtained as follow:
1 mile = 1609.344 m
Therefore,
24900 mile = 24900 mile × 1609.344 m / 1 mile
24900 mile = 4.01×10⁷ m
Finally, we shall determine the time taken for light to circumnavigate the Earth, this can be obtained as follow:
Distance = 4.01×10⁷ m
Speed = 2.998×10⁸ m/s
Time =?
Speed = distance / time
2.998×10⁸ = 4.01×10⁷ / time
Cross multiply
2.998×10⁸ × time = 4.01×10⁷
Divide both side by 2.998×10⁸
Time = 4.01×10⁷ / 2.998×10⁸
Time = 0.13 s
Thus, it will take 0.13 s for light to circumnavigate the Earth.
going down the the periodic table, the number of shells increases resulting in an obvious increase in the atomic radii of the elements
Answer:
Molecules = 7.5 × 10²³ molecules
Explanation:
<u><em>Given:</em></u>
Moles = 1.25 mol
Avogadro's No. = 
= 6.022 * 10²³
<u><em>Required:</em></u>
Molecules = ?
<u><em>Formula:</em></u>
Molecules = Moles ×
<u><em>Solution:</em></u>
Molecules = 1.25 × 6.022 × 10²³
Molecules = 7.5 × 10²³ molecules
