Statistics for AQA - A Level Physics - Waves #3

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Hint	Answer	% Correct
When entering a material with a higher refractive index the wave speed	decreases.	100%
What remains constant when a wave travels into a different medium	Frequency	100%
When entering a material with a lower refractive index the wavelength	increases	100%
What is a coherent source of light	Same frequency and constant phase difference	0%
The angle of incidence is measured relative to	the normal of the boundary.	0%
What is modal dispersion	The spreading out of pulses/loss of signal quality due to the different lengths of paths taken by rays in the optic fibre	0%
What is material dispersion	The spreading out of pulses/loss of signal quality due to the different speeds at which different wavelengths travel in the core	0%
What is the purpose of the cladding on an optic fibre?	To protect the optic fibre from scratches and damage. To prevent the signal from being transmitted into other fibres (cross talk) To provide a large critical angle (and reduce modal dispersion)	0%
When entering a material with a higher refractive index the waves refract	Toward the normal	0%
What can be done to reduce modal dispersion in optic fibres?	Use a narrow core Use a core and cladding with similar refractive indices Use repeaters to reconstruct the signal along the fibre.	0%
How do you prevent material dispersion in optic fibres	Use monochromatic light	0%