Junior Cycle Science Measurement & Units: When green light is shone into a

Question

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 the apparatus shown below to investigate the relationship between the concentration of a red solution and how much green light passes through it.

On one side of the test tube of red solution, green light was emitted from a light emitting diode (LED).

On the other side of the test tube, a light dependent resistor (LDR) was used to detect how much green light passed through the solution.

The student made different concentrations of a solution of red food dye by varying the number of drops of dye added to 20 cm³ of water. The resistance of the LDR was then determined using meter X. The following results were recorded:

Number of drops of food colouring

| Number of drops | Resistance (Ω) |
|----------------|-----------------|
| 0              | 1.0             |
| 1              | 1.5             |
| 2              | 2.0             |
| 3              | 3.0             |
| 4              | 4.0             |
| 5              | 4.5             |
| 6              | 5.0             |
| 7              | 5.5             |

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 d - 2019

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 d - 2019

Name a suitable piece of apparatus to measure the volume of the food dye solution.

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