A Level Physics Practice Exam

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What represents the order number in a diffraction grating experiment?

The correct answer is: n

In the context of a diffraction grating experiment, the order number typically represents the integer that indicates the specific angle at which constructive interference occurs for light waves. This integer is usually denoted by the variable "m." Each integer value of "m" corresponds to a distinct order of the diffraction pattern, with "m=0" representing the zeroth order (the central maximum), and positive and negative integers indicating higher-order maxima on either side of the central maximum. While "p," "n," and "k" are often used in various areas of physics, they do not commonly represent the order number in the context of diffraction gratings. "n" can represent refractive indices in some contexts, "p" might be used for momentum or pressure, and "k" could refer to wave vectors or other parameters depending on the scenario. Thus, "m" is the appropriate choice to represent the order number when analyzing patterns created by a diffraction grating.