6 Light and Optics 6.1 Nature and Propagation of Light
P2210101
Measuring the velocity of light
Principle of measurement.
Principle
Software Speed of Light Meter
The intensity of the light is modulated and the phase relationship of the transmitter and receiver signal compared. The velocity of light is calculated from the relationship between the changes in the phase and the light path. Tasks 1. To determine the velocity of light in air. 2. To determine the velocity of light in water and synthetic resin and to calculate the refractive indices. What you can learn about ▪ ▪ ▪ ▪ ▪ ▪ ▪
Refractive index Wavelength Frequency Phase Modulation Electric field constant Magnetic field constant
The Software for the Speed of Light Meter belongs to the "measure-software" family. This software is charactarisedby easy and intuitive features and is very user friendly.
Main articles Speed of Light Meter Set 25 MHz Digital storage oscilloscope with colour display, 2 x BNC cables l =75 cm incl.
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Related Experiment Measuring the velocity of light using the software measure P2210111
excellence in science 158
With this software all measured quantities from the Speed of Light Meter can be recorded and graphically displayed. Especially the optical distance measurement lends itself to be recorded via software. This way the dynamics of motion (swinging pendulum, moving cart etc.) can be recorded continuosly (1000Hz) without interfering mechanically with the process. 14411-61