The wavelength of light emitted from a laser can be determined using a diffraction grating - Edexcel - A-Level Physics - Question 1 - 2023 - Paper 2
Question 1
The wavelength of light emitted from a laser can be determined using a diffraction grating. The equation used to calculate the wavelength is
$$n \lambda = d \sin \t... show full transcript
Worked Solution & Example Answer:The wavelength of light emitted from a laser can be determined using a diffraction grating - Edexcel - A-Level Physics - Question 1 - 2023 - Paper 2
Step 1
n
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Answer
The variable n represents the order of the diffraction pattern, which is a dimensionless quantity. Therefore, it has no unit.
Step 2
d
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Answer
The variable d is the distance between the slits in the diffraction grating. It is typically measured in meters (m) or millimeters (mm), depending on the context. Thus, in this case, the appropriate unit for d is 'mm'.
Step 3
Which row of the table shows possible units for n and d?
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Answer
Based on the analysis above, the correct row in the table is B, where n has 'no unit' and d has 'mm'.
