A helium-neon laser ($\lambda$ = 632.8 nm) is used to calibrate a diffraction grating.If the first-order maximum occurs at 20.5$\degree$, what is the line spacing, d?
A)1.81* 10-6 m
B)1.00* 10-5 m
C)1.00 * 10-4 m
D)1.31 * 10-6 m
E)6.76 * 10-7 m

Question

Quizplus · Accepted Answer

The correct answer is A.The line spacing, d, can be calculated using the formula:d = $\frac{\lambda}{sin\theta}$where $\lambda$ is the wavelength of the light and $\theta$ is the angle of the first-order maximum.Substituting the given values into the formula, we get:d = $\frac{632.8 nm}{sin 20.5\degree}$ = 1.81 * 10-6 m

A Helium-Neon Laser λ\lambdaλ = 6328 Nm) Is Used to Calibrate a Diffraction Grating

A Helium-Neon Laser $\lambda$ = 6328 Nm) Is Used to Calibrate a Diffraction Grating