User:SRajan
From MariachiWiki
Shruthi has been learning Indian Classical Singing since she was six years old.She is also part of the Chinmaya Mission situated in New York City. Shruthi is secretry in her collage and is hoping to be a RA someday. She is also part of the WISE Student Leadership Council and is a active member of the Pre Med society.
Shruthi attended Plainview Old Bethpage JFK High School. She graduated high school with high honors and is currently enrolled in the biomedical engineering program in Stony Brook University.
Shruthi enjoys trips to the city along with watching TV and reading. Her favorite TV shows include Gossip Girl and Grey’s Anatomy Shruthi hopes to graduate and become a successful surgeon one day.
Shruthi is also part of WISE which stands for Women In Scienc and Engineering. a community that helps women find their stepping in the scientific community.As part of her WISE learning experience Shruthi is currently working on the Mariachi Project which can be found here; WSE187:
Through out the years Shruthi has respected many respectible people in society but the two women who Shruthi truly admires and looks up to are Indira Gandhi [1] and Hillary Clinton [2].
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April 8, 2008
Today we tested to see how many cosmic rays are detected by the detectors in different voltages. We can do this by comparing the coincident of the top and the middle detectors. Firt the detectors were connected to the computer. Then the voltage was adjusted to a certain power. the top and bottom voltages were changed while the middle voltage was kept constant. We kept the voltage changes between 5.0v and 3.5v and we got the following results.
Detector: 700000
0.00 0.000 0.000 5.506v 0.000 2.001v 5.194v 5.892v null 5.803v 5.298v
det 1 356 430 462 4619 4745 4358 3365 3515 3630 3380 3121
det 2 146 147 140 11943 13721 11145 10678 12235 12302 11778 12163
det 3 1126 1127 970 596 0 0 329 1275 184 1075 406
det 4 0 0 0 0 0 0 0 0 0 0 0
det 5 0 0 0 0 0 0 0 0 0 0 0
coin 1,2 242 284 239 1493 1631 1554 1554 1539 1646 1536 1516
coin 1,2,3 128 32 4 1260 0 0 919 1489 252 1458 1086
coin 1,2,4 0 0 0 0 0 0 0 0 0 0 0
coin 1,2,5 0 0 0 0 0 0 0 0 0 0 0
4 fold 0 0 0 0 0 0 0 0 0 0 0
5 fold 0 0 0 0 0 0 0 0 0 0 0
time 10 10 10 100 100 100 100 100 100 100 100
From the data we concluded that as we increased the voltage up to a certain point the efficiency of the detector increases as well.
April 10, 2008
What factors affect the detection of cosmic rays?
Voltage might effects how many cosmic rays pass through a scintillation detector
The angle at which the detector is placed might also effect how many cosmic rays pass through.
The number of particles in the air at that specific time might also effect the number of cosmic rays passing through a detector.
The speed at which the air is travelling might also effect the number of particles going through a detector.
The height at which the detector is kept might also effect the number of particles going through a detector.
Experement Design
I propose an experement where we could find out the efficiency of the detectors. We could do this by first testing how many rays pass through one detector. Now a certain amount of noise is expected. So we add another detector. We keep adding detectors till the data we collect is close to the one we got through a mathamically calculated formula. I proposed such an experement beacuse we have seen through previous experements how voltage effects the efficiency of the detectors. So therefore now we must try and find out how the number of detectors effect the effeciency of the data collected.
The Materials needed for this experiment would be:
-A computer to record the data
-Cables and other such materials to connect the detectors to the computer
-A voltage meter
-Detectors
Procedure
1. First we should set up the equitment.
2. We should calculate the actual value of particles using a mathematical formula
3.We should test the number of particles going through one detector and record the results
4.We should keep adding detectors and recording the results between adding an extra detector
till we reach a number close to the number calculated through our mathematical formula.
Expected Results
One would expect less noise and a more accurate results when there are more dtectors to block out the noise. As now the data is filtered more. So the predictions for this experemt are that the more detectors there are the less noise will be there in the data collected
April 15, 2008
An experement was done to determine how the height or altitude of the detectors effects the number of how many particles pass through it.
Purpose:
To determine how altitude affects the rate of cosmic rays passing through a given surface area.
Materials:
Two detectors in the form of cosmic Chris
One meter stick
One stop watch
Procedure
1.Cosmic Chris was placed flat on the ground in a horizontal direction 2m away from the elevator on the S level of the Physics building.
2.Measured and recorded the number of coincidences between the detectors three times for 120 s each.
3.Step 1 and 2 was repeated on level D
4.From the data collected, the rate each trial was calculated. The average rate and percent deviation for each Level was also calculated.
Data Collected
- Data:
The reason why a higher altitude produces more cosmic rays to go through the detectors is probably beacuse the highter the detectors are the cosmic ray has more chance of not being deflected.
April 17, 2008
The B and C level of the Physics building were measured
- Data:
______
The graph shows us that the altitude does make a diffrence. The higher the detectors were placed the more cosmic rays seem to pass through them.The question now is whetehr the material in between each floor played any part in this change in the rate of how many cosmic rays went through the detectors.
we there fore decidedm to take the detectors outside. So now the data we got outside mcould be compared to the data we got inside on the P level. If there is a major diffrence then we can conclude that materials do make a significant impact on the rate of how many cosmic rays pass through the detectors.
April 22, 2008
Today we made measurements on levels P and A:
- Data:
To see if the materials between the building’s levels make a difference we took the detectors and measured the rate of how many cosmic rays pass through the detectors, from three different points.
____ 
The data was inconclusive but it did tell us about how the data shows that the further away the detectors were placed the more cosmic rays passed through the detectors. This is because when you place the detectors closer to the building the cosmic rays coming at an angle have to pass through the building. When you place the detectors further away from the building the cosmic rays have less chance of hitting anything.
____ 
when a comparission of the data taken in the P level was compared to the data taken outside, it showed that materials did make a difference in the rate of cosmic rays passing through the detectors. The data taken outside had a higher rate of cosmic rays passing through the detectors.
April 24, 2008
A more controlled experiment was performened to determine the effect of materials on the coincidence rate. Two scintillation detectors were laid horizontally on top of one another at a fixed distance from each other. For the first trial, a steel board and lead blocks with the same surface area as a detector were placed between the two detectors. For the second trial, no materials were present between the detectors. The number of coincidences was measured for 120 seconds each. The data obtained, however, was inconclusive, since the change in rate was smaller than the statistical error of each measurement:
to get a smaller error number we measured the coincidence count for 300 seconds instead of 120 s. Nevertheless, the change in rate still was not statistically significant:
The steel and lead blocks were not thick enough to change the rate that much. As a result, we measured the coincidence rate in the MARIACHI lab, where the ceiling is relatively thin, and in a part of the basement overlain with 4 more feet of concrete than in the MARIACHI lab:
____ 
From the data, we can conclude that the coincidence rate decreases as cosmic rays pass through more building material. It would be interesting to determine, however, how much of the change in rate in the previous experiment can be attributed to a change in the amount of material versus a change in altitude. In order to figure this out, we would need to measure the thickness of the roof. Knowing that 4 feet of concrete lowers the coincidence rate by 2.02 ± 0.624 Hz, we could determine what the rate would be on level D if cosmic rays did not pass through the roof and then compare it to the rate outside on ground level (890 in. lower in altitude). Or if possible, we could directly measure the coincidence rate on the roof and compare it to that outside.
