Explanation:
Half-life is the time taken for a radioactive material to decay to half its original composition:
Original mass = 48g
Half- life = 2hr
After four half lives;
Initially: 48g
First halving 24
Second halving 12
Third halving 6
Fourth halving 3
After second half life, we would have 12g
At fourth halving, we would have 3g
Answer:
c
Explanation:
this is because of the fact that the chemical make up of the object is changed. chemical reactions must include a change in substance.
The body of a sentence is usually in the middle
It's 0 m/s because you're both moving on the same machine at the same speed, so it appears that they're not moving