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What equipment is needed for the Double Slit Experiment?
Laser, double slit, white screen, metre ruler.
How do you set up the apparatus for the Double Slit Experiment?
Partially darken the laboratory and set up the laser, double slit, and screen. Adjust the apparatus so that the distance (D) is 0.500m using the metre ruler.
How do you measure the fringe width (w) in the Double Slit Experiment?
Measure across a large number of fringes using the ruler and divide by the number of fringe widths to find the average fringe width (w).
How do you vary the distance (D) in the Double Slit Experiment, and why?
Increase D by 0.100m each time up to 1.500m, repeating the measurement of fringe width each time. This helps to analyse how fringe width changes with distance.
How do you determine the wavelength of the laser light in the Double Slit Experiment?
Plot a graph of fringe width (w) against distance (D) and draw a line of best fit. The wavelength (λ) of the laser light is the gradient (G) multiplied by the slit separation (s): λ=G×s
What safety precautions should be taken during the Double Slit Experiment?
Ensure the laser is pointed away from eyes to avoid eye injury.
How can you improve the accuracy of the Double Slit Experiment?
Align the screen and double slit perfectly normal to the laser to avoid parallax error. Use a set square and ruler for alignment.
What equipment is needed for the Diffraction Grating Experiment?
Laser, diffraction grating, white screen, metre ruler.
How do you set up the apparatus for the Diffraction Grating Experiment?
Partially darken the laboratory and set up the laser, diffraction grating, and screen. Adjust the apparatus so that the distance (D) is 1.000m using the metre ruler.
How do you measure distances for the Diffraction Grating Experiment?
Measure the distances h1 and h2 on either side of the central maximum using the ruler and find the mean of each.
