Radio waves
microwaves
infrared
ultraviolet
X-rays
gamma-rays
- The person that was right about the chemical change is Elsa
- Chemical changes can be regarded as one that takes place when chemical reactions occur and there is formation of new product such as chemical elements or compounds .
- Physical change are one that doesn't result to formation of new chemical substances .
- When someone eat because digestion occur due to breaking down of the food by enzymes into the small molecules the and as result of this new product is formed such as urine , energy and others
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<em>Therefore, Elsa is right.</em>
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Answer:
11552.45 years
Explanation:
Given that:
Half life = 5730 years
Where, k is rate constant
So,
The rate constant, k = 0.00012 years⁻¹
Using integrated rate law for first order kinetics as:
Where,
is the concentration at time t
is the initial concentration
Given that:
The rate constant, k = 0.00012 years⁻¹
Initial concentration
= 160.0 counts/min
Final concentration
= 40.0 counts/min
Time = ?
Applying in the above equation, we get that:-

I really hope this helps I’ve been there too and I’m just doing this so I get the 20 words and I have the picture