An experiment is carried out to determine the wavelength of light from a laser - Scottish Highers Physics - Question 10 - 2017

To find the wavelength ($\lambda$), we can use the formula relating the gradient of the graph to the wavelength. The gradient $m$ can be determined from the graph: $m = \frac{\sin(\theta)}{\frac{1}{d}}$ Substituting in to calculate gradient gives: $\lambda = 4.8 \times 10^{-7} m$

Using the same formula as before, we rearrange to get: $\sin(\theta) = m \cdot d$ Given $d = 2.0 \times 10^{-6}$ m and using the previously calculated wavelength: $\sin(\theta) = \frac{4.8 \times 10^{-7}}{2.0 \times 10^{-6}} = 0.24$ From the graph, $\theta \approx 14^{\circ}$.

1. Repeat measurements to ensure accuracy and consistency.
2. Use additional gratings to gather more data points, which can help in refining the results.