Select the vertical axis as Light Intensity, and Horizontal axis as Actual Angular Position.In the PASCO data acquisition software, select the graph mode.The measured Angular Position should be divided by 2À. Use the PASCO software’s calculator function to calculate the Actual Angular Position based on the Angular Position measurement made by the Rotary Motion Sensor.A sample rate of 20 Hz with a high resolution of 1440 Divisions per Rotation. Set up parameters for the Rotary Motion Sensor.Connect Analog Channel A to the Light Sensor. Connect Digital channels 1 and 2 to the Rotary Motion Sensor.Open the PASCO data acquisition software.Connect the Light Sensor and Rotary Motion Sensor to channels A and B of the PASCO computer interface.Turn on the light source and align the light beam by adjusting the Collimating Slits, Collimating Lens and Focusing Lens so a clear image of the central ray appear on the light sensor. A hood should be used over the light source to remove any distortion in the experiment results.
Mask the light source with Collimating Slits so it transmits a thin 0.5 to 1.0 cm beam.Set up the Spectrophotometer next to your chosen light source as shown in Figure 2. This is commonly used to separate colours of the incident light because the diffracted light has different angles according to:Īll equipment used for this experiment was taken from the ‘PASCO Educational Spectrophotometer Accessory Kit’ When a beam of light is directed at the grating, light will diffract of it and the light is dispersed in certain directions only. The slits are very small, usually 600 per 1mm. Water vapour can carry out the same effect of diffraction, and the result is a rainbow.Ī diffraction grating is a slide with a number of parallel slits drawn on it. By diffraction, the white light splits apart into different colours of visible light. We can see each colour of the Visible light spectrum by shining a white light through a prism. The combination of all the light wave colours makes white light.
The longest wavelength is Red, with the shortest wavelength being Violet. Each different colour has its own wavelength different to the others. We see visible light waves as colours of the rainbow. The only Electromagnetic waves we can see are Visible Light Waves. All different size waveforms have different uses. It ranges from the smallest waves possible, radio waves to the largest waves, Gamma radiation. The electromagnetic spectrum describes all the wavelengths. I will measure the angle at which colour splits. I will carry out this experiment with three different light sources: This experiment studies the wavelengths of the colours in the spectrum of a light source.
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