Andrew pokes a marble, and the marble rolls down a ramp. The marble moves with speed. Which forces are acting on the marble in t
2 answers:
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<u>Answer:</u> The final temperature of the solution is
<u>Explanation:</u>
The amount of heat released by coffee will be absorbed by aluminium spoon.
Thus,
To calculate the amount of heat released or absorbed, we use the equation:
Also,
..........(1)
where,
q = heat absorbed or released
= mass of aluminium = 39 g
= mass of coffee = 166 g
= final temperature = ?
= temperature of aluminium =
= temperature of coffee =
= specific heat of aluminium =
= specific heat of coffee=
Putting all the values in equation 1, we get:
Hence, the final temperature of the solution is
From the activity values and the decay constant, the mass of of Strontium in the sample is:
The decay constant of an element is the probability of decay of a nucleus per unit time.
{λ = ln 2 / t1/2
where;
t1/2 is the half-life of the isotope.
The half-life is converted to seconds since the decay constant is asked in per seconds.
Hence;
The activity of the element, A, the decay constant, λ and the number of nuclei, N are related as follows:
- A = (–) λN
Molar mass of Strontium-90 is 90 g.
1 mole of Strontium-90 contains 6.02×10^23 nuclei.
The mass, m of Strontium in the sample is calculated:
Therefore, the mass of of Strontium in the sample is:
Learn more about decay constant at: brainly.com/question/17159453