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DiKsa [7]
3 years ago
9

Pls help will mark Brainliest

Physics
2 answers:
Rudiy273 years ago
7 0
I want to say the answer is 100
emmainna [20.7K]3 years ago
4 0

Answer: 100

Hard to guess the units. Could be 100 meters if it's a mountainous area. Could be 100 centimeters if it's a lot flatter. Could be cubits or spans. the map gives no clues except that the horizontal dimension is metric km, so likely metric units on the vertical scale as well.

Explanation:

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An investigator collects a sample of a radioactive isotope with an activity of 490,000 Bq.48 hours later, the activity is 110,00
Daniel [21]

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,

⇒ A = A_0 e^{- \lambda t}

or,

⇒ \frac{A}{A_0}=e^{-\lambda t}

By taking "ln", we get

⇒ ln \frac{A}{A_0}=- \lambda t

By substituting the values, we get

⇒ -ln \frac{110000}{490000} = -48 \lambda

⇒    -1.4939=-48 \lambda

                 \lambda = 0.031122

As,

⇒ \lambda = \frac{ln_2}{\frac{T}{2} }

then,

⇒ \frac{ln_2}{T_ \frac{1}{2} } =0.031122

⇒ T_\frac{1}{2}=\frac{ln_2}{0.031122}

         =22.27 \ hours  

3 0
3 years ago
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