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The velocity of light is determined by focusing a deflected laser beam back and forth from a rotating mirror to a fixed mirror and measuring the deflection of the beam’s image from its original path. The deflection of the beam is directly related to the frequency of rotation of the mirror and inversely related to the speed of light. Students record data sets of mirror rotation frequency, measured by listening for zero beats of the mirror with an audio-oscillator, and beam deflection, measured by sighting through a lens onto a millimeter scale in the path of the beam. By plotting these data sets and knowing the distance between the mirrors and the laser source, the speed of light can be calculated from the slope of the linear relationship between deflection and frequency. (15 minutes)



 
            

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Part of the Series : Experiment: Physics
     


Only available in the US and Canada.




Millikan's Oil-Drop Experiment

This program uses a modified version of the Millikan oil-drop apparatus to measure the radius and total charge of oil droplets. Students measure the terminal velocity of an oil drop falling under gravity in order to calculate the radius of the drop....(more details)
 
The Rutherford Scattering of Alpha Particles

The experimental observations which led to the development of the Rutherford model of the atom are reproduced in this program. Students record the number and energy of ??particles scattered at different angles from bombarded thin foils of different p...(more details)
 
Experiments on the Doppler Effect

Detection of the Doppler effect-the frequency shift between source and receiver when they are traveling at different relative velocities-is common in everyday activities. In this program, students quantitatively examine this shift for sound waves fro...(more details)
 
The Determination of the Newtonian Constant of Gravitation

The Newtonian constant of gravitation is determined by measuring the gravitational force of attraction between massive spheres of lead and mercury. A torsion balance is used to measure the deflection angle which balances the torsional couple of the b...(more details)
 
Electron Diffraction

The wave behavior of electrons is studied by measuring the diffraction ring diameters produced when accelerated electrons pass through a graphite lattice. Students record the ring diameters for different electron accelerating voltages. The wavelength...(more details)
 


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