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Sunlight is made up of different colours and invisible radiations - Leaving Cert Physics - Question b - 2008
Question b
Sunlight is made up of different colours and invisible radiations. (i) How would you show the presence of the different colours in light? (ii) Name two radiations... show full transcript
Worked Solution & Example Answer:Sunlight is made up of different colours and invisible radiations - Leaving Cert Physics - Question b - 2008
Step 1
How would you show the presence of the different colours in light?
Answer
To demonstrate the presence of different colours in light, you can use the following equipment and procedure:
Apparatus:
- Glass prism
- Light source (e.g., a lamp)
- Dark screen or wall
Procedure:
- Place the light source so that it shines on one side of the prism.
- Position a screen or wall on the other side of the prism to capture the projected light.
- Observe how the light refracts through the prism, spreading into a spectrum of colours.
Observation/Conclusion: You will see that the light spreads out into various colours, demonstrating that sunlight consists of multiple wavelengths.
Step 2
Step 3
Describe how to detect one of these radiations.
Answer
To detect infra-red radiation, you can use a device specifically designed to measure temperature:
Apparatus:
- Thermometer or a temperature sensor
Method:
- Place the thermometer in a location where it can be exposed to sunlight.
- Observe the reading; if the temperature is significantly higher than the surrounding area, this indicates the presence of infra-red radiation, which the human eye cannot see.
Step 4