Hello,
I'm stuck with Q 2.2, Q 2.4 and Q 2.5 in the link below. Can anyone please help me with these questions? Thanks ")
Hello!
- For 2.2, I can't see the referenced diagram! It is almost certainly just using Speed=Distance/Time? The distance probably comes from multiples of the wavelength and you are given the speed \(v\), so your answer will be something like ?A/v. Maybe?
- For 2.4(b), use \(d\sin{\theta}=m\lambda\), since that is effectively what this situation is. By increasing the frequency, the wavelength is reduced, which means the associated \(\theta\) for minimum disturbance lines is decreased.
This is a great simulator for this exact situation
- For 2.4c), places where the wavelets constructively interfere correspond to maxima. Where they destructively interfere corresponds to minima (least disturbance). The diagram will look really similar (identical) to that one I included in an answer a couple of days ago!
Make sure you understand the parallels between 2.4 and the double slit experiment, it's really important to have that conceptualisation set
For 2.5, it's a bit weird to ask for diagrams, I'm guessing they want some similar to that in this video?
https://www.youtube.com/watch?v=tlBgvHzppKkEssentially, Newton thought light was a particle (a corpuscle), and that it reflected by the particle literally bouncing off a surface. Huygen thought it was a wave, reflecting essentially as a consequence of
Huygen's Principle (that each point on a wavefront can be thought of as a source of wavelets, and that the leading edge of these wavelets is the actual wavefront). To my interpretation of the syllabus though, that isn't something you need to understand in a whole lot of depth