IB Physics HL C.3.8 Two-Source Interference Question Bank
Practise IB Physics HL C.3.8 by solving two-source fringe, intensity and geometry problems for light, sound and water waves.
- Syllabus
- First assessment 2025
- Course
- Physics HL
- Level
- HL
C.3.8—Two-source interference question 1
A student investigates how light can be used to measure the speed of a toy train.
Light from a laser is incident on a double slit. The light from the slits is detected by a light sensor attached to the train.
The graph shows the variation with time of the output voltage from the light sensor as the train moves parallel to the slits. The output voltage is proportional to the intensity of light incident on the sensor.
Explain, with reference to the light passing through the slits, why a series of voltage peaks occurs.
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