Other
AQA A-level Physics Diffraction Gratings Mark Scheme
- Module
- Waves and Optics (PHYA2)
- Institution
- AQA
Mark scheme for the corresponding document: 'AQA A-level physics Diffraction Gratings'.
[Show more]
Seller
Follow
Content preview
theonlinephysicstutor.comMark schemes
A
1 [1]
C
2 [1]
A
3 [1]
B
4 [1]
sinθ = nλ/d in this form/correct calculations of d/d = 1/300
5
C1
substitutes correctly – condone powers of 10
C1
18.9
C1
2 or 3 sf only
A1
[4]
(a) 1.06 × 10-6 m
6
B1
1
@TOPhysicsTutor facebook.com/TheOnlinePhysicsTutor
Page 23 of 38
, theonlinephysicstutor.com
(b) use of nλ = dsinθ with n = 2 and d = ans to (a)
C1
λ = 1.06 × 10-6 × sin 55º/2
C1
4.34 × 10-7 m
A1
3
[4]
(a) (i) = 590 × 10–9m (1)
7
(using d sin θ = nλ gives)
(1) = 0.707 or
7.07 × 108 if nm used (1)
θ = 45.0° (1) (accept 45°)
(ii) (sin θ ≤ 1) gives ≤ 1 or n ≤ or = (1) = 2.83 (1)
so 3rd order or higher order is not possible (1)
alternative solution:
(substituting) n = 3 (into d sin θ = nλ gives) (1)
sin θ ( ) = 1.06 (1)
gives ‘error’/which is not possible (1)
7
(b) (using d sin θ = nλ gives)
2 λ = 1.67 × 10–6 × sin 42.1 (1)
λ(= 0.5 × 1.67 × 10–6 × sin 42.1) = 5.6(0) × 10–7 m (or 560 nm) (1)
2
[9]
@TOPhysicsTutor facebook.com/TheOnlinePhysicsTutor
Page 24 of 38
, theonlinephysicstutor.com
(i) use of (26 ± 2) mm for 2θ or (13 ± 1) mm for θ
8
M1
range 2.60 → 3.02
A1
(ii) nλ= d sin θ seen
M1
substitution with correct powers
1.20 × 10−5 → 1.40 × 10−5
A1
1/d or number of lines m−1 calculated
71400 → 833300 needs unit
B1
conversion to number of lines mm−1
71(.4) → 83(.3) needs unit
B1
[6]
(a) d sin θ = n λ or d sin 12 = 6.3 x 10–7
9
C1
3.0 x 10–6 m
A1
2
@TOPhysicsTutor facebook.com/TheOnlinePhysicsTutor
Page 25 of 38
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller TheQuizMaster. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77858 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now
