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Sindrei [870]
3 years ago
8

The amount of ozone, Q, in the atmosphere is decreasing at a rate proportional to the amount of ozone present. If time t is meas

ured in years, the constant of proportionality is -0.0025. Write a differential equation for Q as a function of t.
Give the general solution for the differential equation. Let C represent the arbitrary constant from integration.
Q=C

If this rate continues, approximately what percent of the ozone in the atmosphere now will decay in the next 27 years? Round your answer to one decimal.
Mathematics
1 answer:
Firdavs [7]3 years ago
6 0

Answer:

Differential equation: \frac{dQ}{dt} = rQ = -0.0025Q

Solution of diff equation: Q(t) = Ke^{-0.0025t}

6.3% of the ozone in the atmosphere now will decay in the next 27 years.

Step-by-step explanation:

The amount of ozone in the atmosphere may be found by the following differential equation:

\frac{dQ}{dt} = rQ

In which r is the constant of proportionality and Q is the amount of ozone. A positive value of r means that the amount of ozone in the atmosphere is going to increase, while a negative value means it is going to decrease.

Solving the differential equation:

We integrate both sides of the differential equation and apply the exponential function. So:

\frac{dQ}{dt} = rQ

\frac{dQ}{Q} = r dt

Integrating both sides

\ln{Q} = rt + K

Applying the exponential:

Q(t) = Ke^{rt}

In which K is the initial amount of ozone.

So

Q(t) = Ke^{-0.0025t}

If this rate continues, approximately what percent of the ozone in the atmosphere now will decay in the next 27 years?

This K-Q(27).

Q(27) = Ke^{-0.0025*27} = 0.9347K

K - 0.9347K = 0.0653.

6.3% of the ozone in the atmosphere now will decay in the next 27 years.

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=============================================

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The last thing you would do is to check if the answers is correct.
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You may have to do this by yourself :P

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