When green light is shone into a red solution, such as blood, some of the light is absorbed, some is reflected and some passes straight through - Junior Cycle Science - Question 12 - 2019
Question 12
When green light is shone into a red solution, such as blood, some of the light is absorbed, some is reflected and some passes straight through.
A student set up th... show full transcript
Worked Solution & Example Answer:When green light is shone into a red solution, such as blood, some of the light is absorbed, some is reflected and some passes straight through - Junior Cycle Science - Question 12 - 2019
Step 1
Draw a graph of the results obtained.
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Answer
To draw the graph, first plot the points based on the given data from the table onto the graph. For each number of drops of food coloring (x-axis) from 1 to 8, find the corresponding resistance value (y-axis) and mark the points. After plotting the points, connect them with a smooth line to show the trend.
Step 2
State one conclusion which is supported by the results.
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Answer
The results show that as the concentration of red food coloring increases, the resistance of the LDR also increases. This indicates that more light is absorbed by the solution, resulting in less green light passing through.
Step 3
Name meter X, which was used to determine the resistance of the LDR.
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Answer
Meter X is called an Ohmmeter.
Step 4
Name a piece of equipment the student could have used to accurately measure 20 cm³ of water.
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Answer
The student could use a pipette, burette, graduated cylinder, syringe, or volumetric flask to accurately measure 20 cm³ of water.
Step 5
Describe one other technological application of physics that is used in everyday life.
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Answer
One common application of physics in everyday life is the use of GPS technology. It relies on the principles of satellite communication and physics of motion to provide accurate location and navigation services.
Step 6
Name chamber X.
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Chamber X is the Left ventricle.
Step 7
Explain why some of the tubes connected to the heart are coloured red and some of them are coloured blue.
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Answer
The tubes that are coloured red represent oxygenated blood, while the blue tubes represent deoxygenated blood. This color coding helps to easily identify the type of blood being transported: red for blood rich in oxygen, and blue for blood that is low in oxygen.
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