Finding collected count when given average value.

AI Thread Summary
To find the collected count from the given activity counts per minute, sum the values for each time interval. For example, after the first two minutes, the total would be 495 + 395. The average background count of 30 counts per minute is provided for context but does not directly affect the collected count calculation. The mention of half-life being meaningless to background count suggests that background count remains constant over time, regardless of decay processes. Understanding these concepts will help clarify how to plot the graph accurately.
Hellreignz
Messages
2
Reaction score
0
Good morning everyone, I would really be pleased with a quick answer because I am very soon going to school. I have been asked to plot a graph, for that I am given a table with time in minutes from 0 to 6 on the first row. On the second row I was given activity in counts per minute with values 495,395,320,258,220,180,140 (they are ranged in columns below corresponding time). Then the third row is a blank row asking me collected count (in counts per minute) and I just don't know how to get it. I have been given average value of the background count which is 30 counts per minute. There is also a question asking to a certain that average value of background count is 30. I just don't know what to do please help me. :nb)
 
Physics news on Phys.org
And please why is half-life meaningless to background count?
 
I think that by "collected" they mean all the counts up to that time.
If you had 495 counts in the first minute and 395 in the second, you had 495+395 after the first 2 minutes.

I don't understand what are you saying in the last three sentences.
 
Consider an extremely long and perfectly calibrated scale. A car with a mass of 1000 kg is placed on it, and the scale registers this weight accurately. Now, suppose the car begins to move, reaching very high speeds. Neglecting air resistance and rolling friction, if the car attains, for example, a velocity of 500 km/h, will the scale still indicate a weight corresponding to 1000 kg, or will the measured value decrease as a result of the motion? In a second scenario, imagine a person with a...
Scalar and vector potentials in Coulomb gauge Assume Coulomb gauge so that $$\nabla \cdot \mathbf{A}=0.\tag{1}$$ The scalar potential ##\phi## is described by Poisson's equation $$\nabla^2 \phi = -\frac{\rho}{\varepsilon_0}\tag{2}$$ which has the instantaneous general solution given by $$\phi(\mathbf{r},t)=\frac{1}{4\pi\varepsilon_0}\int \frac{\rho(\mathbf{r}',t)}{|\mathbf{r}-\mathbf{r}'|}d^3r'.\tag{3}$$ In Coulomb gauge the vector potential ##\mathbf{A}## is given by...
Thread 'Griffith, Electrodynamics, 4th Edition, Example 4.8. (First part)'
I am reading the Griffith, Electrodynamics book, 4th edition, Example 4.8 and stuck at some statements. It's little bit confused. > Example 4.8. Suppose the entire region below the plane ##z=0## in Fig. 4.28 is filled with uniform linear dielectric material of susceptibility ##\chi_e##. Calculate the force on a point charge ##q## situated a distance ##d## above the origin. Solution : The surface bound charge on the ##xy## plane is of opposite sign to ##q##, so the force will be...
Back
Top