The answer to your question is liquid hydrogen
Answer:
Centimeters or milimeters.
Explanation:
The answer depends on the size of the box.
<em>The metric system </em><u><em>base</em></u><em> unit for length is the meter</em>. <em>Centimeters</em> and <em>milimeters</em> are thus also part of the metric system.
If the box is a "regular-sized" box that we use to put stuff in (books, presents, etc), then centimeters would be the most appropiate.
If we're talking about those tiny boxes that are printed on paper (for example in some notebooks) then milimeters would be the most appropiate.
Yes the ANSWER is Correct-
On first half life the mass will be 10 gram
On second half life the mass will be 5 gram
On third half life the mass will be 2.5 gram
