A level physics doubt about a Diffraction grating

[Atomsmasher2001]

Homework Statement

Monochromatic light of wavelength 690nm passes through a diffraction grating with 300 lines per mm, producing a series of maxima on a screen. What is the greatest number of maximas that can be observed?
A) 4
B) 5
C) 8
D) 9

Homework Equations

n*wavelength = d*sin x

The Attempt at a Solution

Well, I took it as: wavelength= 690x10^-9 m
D = 300 x 10^-3 m
So I tried substituting in the equation but I didn’t know what angle to take. So yeah that’s where I’m stuck.[/B]

 

[renec112]

What have you tried? Where exactly are you stuck?

 

[Atomsmasher2001]

What have you tried? Where exactly are you stuck?

Well, I took it as: wavelength= 690x10^-9 m
D = 300 x 10^-3 m
So I tried substituting in the equation but I didn’t know what angle to take. So yeah that’s where I’m stuck.

 

[fresh_42]

@Atomsmasher2001 In general, please give us some more context in section two of the template and show more effort to solve the problem in section three. Usually you will have made some considerations, drawings or even calculations, so show them. I counted your previous post #3 as such an effort, although it lacks more than it shows.

 

[Atomsmasher2001]

@Atomsmasher2001 In general, please give us some more context in section two of the template and show more effort to solve the problem in section three. Usually you will have made some considerations, drawings or even calculations, so show them. I counted your previous post #3 as such an effort, although it lacks more than it shows.

Ok sorry. But this is all the relevant formulas for this. My working I’ll show more. But I have no clue for this so I’m getting a completely wrong answer(not even close to the options).