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  1. Subjects ›
  2. GRE Subject Test Physics ›
  3. Question of the Day

GRE Subject Test Physics Question of the Day

GRE Subject Test Physics Question of the Day

Answer today's GRE Subject Test Physics question, reveal the full explanation, then keep the streak going with a new question every day.

A beam of light, with wavelength , is normally incident on a transmission diffraction grating. With respect to the incident beam, the first order diffraction maximum occurs at an angle of . What is the number of slits per centimeter on the grating?

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Question of the Day

A beam of light, with wavelength , is normally incident on a transmission diffraction grating. With respect to the incident beam, the first order diffraction maximum occurs at an angle of . What is the number of slits per centimeter on the grating?

  1. (correct answer)

Explanation: The equation describing maxima of a diffraction grating is: Where d is the separation of slits, which can also be expressed as: Substituting d into the first equation and making the small angle approximation, one can solve for (lines per length): Note that the angle had to be converted from degrees to radians. Finally, the question asks for lines per centimeter, not meter, so the answer becomes .