You are Here: Home >< Physics

# Hard question or rigged?

Announcements Posted on
Would YOU be put off a uni with a high crime rate? First 50 to have their say get a £5 Amazon voucher! 27-10-2016

1. https://gyazo.com/8bf6d759834c7ec2cca480891db6f4b0

I got A and C but the markscheme says C only any explanations?
2. I also need help,

In general can someone say what happens when the slit is smaller, and what happens when the slit is karger?
3. (Original post by Xenon17)

https://gyazo.com/8bf6d759834c7ec2cca480891db6f4b0

I got A and C but the markscheme says C only any explanations?
The angle of the first order beam will have a sine which is half of the sine of the second order beam. It is the sines that will halve, not the angles.
4. (Original post by Pangol)
The angle of the first order beam will have a sine which is half of the sine of the second order beam. It is the sines that will halve, not the angles.
Yes with that in mind i still get A and C
5. (Original post by Xenon17)
Yes with that in mind i still get A and C
Halving angles Halving
6. (Original post by Xenon17)
Yes with that in mind i still get A and C
maybe you're thinking about a small angle approximation.
halving sin (Θ) implying halving Θ is a good approximation... but only when Θ is a small angle, the question doesn't say anything about the size of Θ (and the diagram doesn't make Θ look small tbh)

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: June 8, 2016
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:
Today on TSR

### University open days

Is it worth going? Find out here