The awnsers is D all the planet's in the solar system rotate the same direction or else they would bump into each other
Answer:
A proposed answer to a s scientific problem is a hypothesis.
Answer:
The correct answer is "22.27 hours".
Explanation:
Given that:
Radioactive isotope activity,
= 490,000 Bq
Activity,
= 110,000 Bq
Time,
= 48 hours
As we know,
⇒ 
or,
⇒ 
By taking "ln", we get
⇒ 
By substituting the values, we get
⇒ 
⇒ 

As,
⇒ 
then,
⇒ 
⇒ 
Explanation:
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