PHYSICS HIGH SCHOOL

in 1959 the Santa Susana Field Laboratory had the first and worst) nuclear meltdown in the US history. In this accident, radioactive isotopes 1-131 and Cs-137 were released into the surroundings. Given that the half-life of l-131 is 8.02 days, what percentage of the initial l-131 has decayed up to year 2021? 0 100 % O 0% O 50% 0 95% O 70%

Answers

Answer 1
Answer:

Answer:

To calculate the percentage of l-131 that has decayed up to the year 2021, we need to determine how many half-lives have passed from 1959 to 2021 and then calculate the remaining percentage.

The half-life of l-131 is 8.02 days.

First, calculate the number of half-lives that have passed from 1959 to 2021:

Number of years = 2021 - 1959 = 62 years

Since each year has approximately 365 days:

Number of days = 62 years * 365 days/year = 22,630 days

Now, calculate the number of half-lives:

Number of half-lives = Number of days / Half-life = 22,630 days / 8.02 days/half-life ≈ 2822 half-lives

Now, we know that each half-life reduces the remaining amount to half. So, to calculate the percentage remaining after 2822 half-lives:

Percentage remaining = (1/2)^2822 * 100 ≈ 0%

So, approximately 0% of the initial l-131 has decayed up to the year 2021.

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The Last one ☝️ I think

For which of these scenarios is total internal reflection possible?

Answers

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Displacement vectors of 5 km north, 3 km east, 2 km south, and 3 km west combine to a total displacement of ___

Answers

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The bob of a pendulum has 600 J of kinetic energy at the bottom of its swing. As the bob rises to a height of 4 m above the bottom, it gains 400 J of potential energy. How much kinetic energy does it have at this point?200 J

300 J

400 J

1000 J

Answers

Answer:

The K.E of the pendulum is, K.E = 200 J

Explanation:

Given data,

The kinetic energy of the bob of the pendulum at the bottom, K.E = 600 J

The potential energy at the height 4 m, P.E = 400 J

According to the conservation of energy, the total energy of the mechanical system should be conserved.

At the bottom of the swing, the entire mechanical energy of the pendulum is purely kinetic. Therefore the total energy

                                      E = P.E + K.E

                                          = 0 + 600 J

                                           = 600 J

Therefore, the total energy of the system, E = 600 J

At height 4 m, the total energy of the system remains the same.

Therefore,

                                           600 J = 400 J + K.E

                                              K. E = 600 J - 400 J

                                                      = 200 J

Hence, the K.E of the pendulum is, K.E = 200 J

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Answers

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Calculate the acceleration of a boat that has been cruising at 15 m/s but speeds up to 45 m/s in about 6 seconds. Don’t forget your units, m/s2. In order to calculate the acceleration of the boat we first have to identify the suited formula for acceleration in this scenario. 

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Solution: 
A = 45 m/s – 15m/s / 6s 
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The shorter the time required to cover the same distance, the greater the speed of the RC car.

Further explanation

Acceleration is rate of change of velocity.

\large {\boxed {a = (v - u)/(t) } }

\large {\boxed {d = (v + u)/(2)~t } }

a = acceleration (m / s²)v = final velocity (m / s)

u = initial velocity (m / s)

t = time taken (s)

d = distance (m)

Let us now tackle the problem!

The formula for finding speed is:

\large {\boxed {v = (s)/(t)} }

v = velocity (m/s)

s = distance (m)

t = time taken (s)

From the formula above, it is clear that speed is inversely proportional to travel time. The shorter the time required to cover the same distance, the greater the speed of the RC car.

For example, let's look at the data in the table in the attachment. RC Car B has the greatest speed

Learn more

Answer details

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate

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It refers to the date where a product should no longer be eaten and isn't fresh enough

The expiration date on a product refers to the last date a product should be used


or should be costumed by


I hope that's help !
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