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Answer:
The rock is 3.75 billion years ago.
Explanation:
Given that:
Half life = 1.25 billion years
1 billion years = 10⁹ years
So,
Half life = 1.25 × 10⁹ years
Where, k is rate constant
So,
The rate constant, k = 5.5452 × 10⁻¹⁰ years⁻¹
Initial amount [A₀] = 80 micrograms
Final amount ![[A_t]](https://tex.z-dn.net/?f=%5BA_t%5D)
= 10 micrograms
Using integrated rate law for first order kinetics as:
![[A_t]=[A_0]e^{-kt}](https://tex.z-dn.net/?f=%5BA_t%5D%3D%5BA_0%5De%5E%7B-kt%7D)
So,
So,
<u>The rock is 3.75 billion years ago.</u>
To protect Venice (a city in Italy) from over-tourism, the number of tourists allowed should be 55,000 per day.
Venice is a beautiful city in Italy that attracts a great deal of tourists. Some 20 million people flood Venice every year. on its busiest days, the tourist number increases to 120,000 which is almost double the population residing there.
Venice is in the mood to reduce tourist entry due to the fact that many people come on cruises, stay for a few hours, and leave, providing no economic benefit.
The visitors who do stay for a night or two may also contribute to Venice's problems. Due to high property prices, owners are converting family homes and low-income rentals into lucrative holiday rentals. As a result, housing is becoming increasingly expensive, and only the very wealthy can afford to live here.
The very well solution is that the tourist count should be limited to just as the population count who are the permanent residents i.e. 55,000.
To know more about Venice check this:
brainly.com/question/7066718
