A student investigates how the infrared radiation detected from an electric heater changes with distance.
She places an infrared sensor at different distances from the heater and records the reading on the sensor.
The Table shows her results.
Table
| Distance from heater in cm\text{cm}cm | 10 | 20 | 30 | 40 | 50 |
|---|---|---|---|---|---|
| Sensor reading in W/m2\text{W/m}^2W/m2 | 400 | 100 | 44 | 35 | 16 |
Name the source and the absorber of the infrared radiation in this investigation.
Identify the anomalous result in the Table.
Describe how the sensor reading changes as the distance from the heater increases.
Use data from the Table in your answer.
The student does the investigation in a room with a radiator that is switched on.
Suggest why this could affect her results.
Suggest one safety precaution the student should take during this investigation.
48 exam-style questions on OCR GCSE Physics 5.2 The electromagnetic spectrum, covering 5.2.1 Electromagnetic waves in space, 5.2.2 Energy transfer by electromagnetic waves, 5.2.3 Frequency and wavelength across the spectrum, 5.2.4 Groups of the electromagnetic spectrum, 5.2.5 Visible light and the limits of human sight, 5.2.6 Light as an electromagnetic wave, 5.2.7 Uses of electromagnetic waves, 5.2.8 Hazards of ultraviolet, X-rays and gamma rays, 5.2.9 Ultrasound and imaging inside the body, and 5.2.10 Radio waves and oscillating circuits. Each one has a worked solution and a mark scheme showing where the marks go.