Turn on thread page Beta
 You are Here: Home >< Physics

# Diffraction Grating problem (AQA - A, June 2005, section A Q6) watch

1. Hi there folks, this is my first post but what better way to start than a question about diffraction gratings.
As I said in the thread title, the particular question thats bugging me is question 6 off the AQA A syllabus, June 2005.
The question reads:

''Light of wavelength λ is incident normally ona diffraction grating for which adjacent lines are a distance 3λ apart. What is the angle between the second order maximum and the straight through position?''

Its a multiple choice and the answers are:

a.) 9.6°
b.) 20°
c.) 42°
d.) There is no second order maximum

Now basically this has me confused, as normally for these questions I would use d SinΘ = nλ but I don't see how that would work?

Anyway, if any of you kind folk could explain the procedure for working this out, I'd be much obliged. Thanks, Andy x
2. (Original post by Andrew Charlton)
Hi there folks, this is my first post but what better way to start than a question about diffraction gratings.
As I said in the thread title, the particular question thats bugging me is question 6 off the AQA A syllabus, June 2005.
The question reads:

''Light of wavelength λ is incident normally ona diffraction grating for which adjacent lines are a distance 3λ apart. What is the angle between the second order maximum and the straight through position?''

Its a multiple choice and the answers are:

a.) 9.6°
b.) 20°
c.) 42°
d.) There is no second order maximum

Now basically this has me confused, as normally for these questions I would use d SinΘ = nλ but I don't see how that would work?

Anyway, if any of you kind folk could explain the procedure for working this out, I'd be much obliged. Thanks, Andy x
it does work...

d=3lambda

sintheta = n/3

n=2

sintheta=2/3

theta=42

3. Thanks very much. You know the feeling where your just staring at a question and it just doesn't click? Yeah I had this feeling for that question.

Thanks very much

Reply
Submit reply
Turn on thread page Beta
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: June 12, 2006
Today on TSR

### Cambridge interviews

Find out who is getting invitations

### University open days

• University of Roehampton
All departments Undergraduate
Sat, 17 Nov '18
• Edge Hill University
Faculty of Health and Social Care Undergraduate
Sat, 17 Nov '18
• Bournemouth University
Undergraduate Open Day Undergraduate
Sat, 17 Nov '18
Poll

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.