• Support PF! Buy your school textbooks, materials and every day products Here!

How many lines per centimeter does the grating have?

  • Thread starter George_H
  • Start date
1
0
1. Homework Statement

The light shining on a diffraction grating has a wavelength of 488 nm (in vacuum). The grating produces a second-order bright fringe whose position is defined by an angle of 8.02°. How many lines per centimeter does the grating have?


2. Homework Equations

d sin q = nl

3. The Attempt at a Solution

d = (2)(488)/sin(8.02) = 6995.474955

d = 1/N

N = 1/d = 1/6995.474955 =1.429495505X10^-4 (per M) X 100 = 0.014294955

It got this answer and it is wrong, I have no idea where to go from here or what to do and would be grateful of any help, thanks!
 

Answers and Replies

hage567
Homework Helper
1,509
1
You should convert the wavelength from nanometers to meters (or cm, whatever). I don't think you did that properly.
 
Last edited:

Related Threads for: How many lines per centimeter does the grating have?

Replies
1
Views
91K
Replies
5
Views
2K
Replies
4
Views
581
Replies
13
Views
1K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
5
Views
1K
Replies
2
Views
6K
Top