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
In the space below, draw a graph of the results obtained.
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Answer
To draw the graph, plot the number of drops of food colouring on the x-axis and resistance (Ω) on the y-axis. Each point corresponds to the number of drops and the respective resistance from the table. Then connect the points with a line to represent the trend.
Step 2
State one conclusion which is supported by the results.
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Answer
The resistance of the LDR increases as the number of drops of food coloring increases, indicating that the absorption of green light by the red solution increases with concentration.
Step 3
Name meter X, which was used to determine the resistance of the LDR.
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Answer
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
A pipette or a graduated cylinder.
Step 5
Describe one other technological application of physics that is used in everyday life.
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Answer
One example is the use of thermometers that employ the principles of thermal expansion to measure temperature.
Step 6
Name chamber X.
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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 red tubes are typically arteries carrying oxygenated blood from the heart to the body, while the blue tubes are veins carrying deoxygenated blood back to the heart.
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