8.2c Ex2 ON18 P21 Q4 Double Slit Experiment | AS Superposition | Cambridge A Level Physics

Ex2 - 9702/21/O/N/18: (a) State the principle of superposition. (b) An arrangement for demonstrating the interference of light is shown in Fig. 4.1.
The wavelength of the light is 610 nm. The distance between the double slit and the screen is 2.7 m.
An interference pattern of bright fringes and dark fringes is observed on the screen. The centres of the bright fringes are labelled B and centres of the dark fringes are labelled D. Point P is the centre of a particular dark fringe and point Q is the centre of a particular bright fringe, as shown in Fig. 4.1. The distance across five bright fringes is 22 mm.
(i) The light waves leaving the two slits are coherent. State what is meant by coherent.
(ii) 1. State the phase difference between the waves meeting at Q. 2. Calculate the path difference, in nm, of the waves meeting at P.
(iii) Determine the distance a between the two slits.
(iv) A higher frequency of visible light is now used. State and explain the change to the
separation of the fringes.
(v) The intensity of the light incident on the double slit is now increased without altering
its frequency. Compare the appearance of the fringes after this change with their
appearance before this change.
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[@nawfaljafri]

oh my godthe first quesiton was literlaly almost the exact same in the may june paper 22 2022- IF ONLY I WATHCED THIS A FEW WEEK AGO

[@nigeldumbu2246]

Thank u so much I struggle with phase difference and path difference ..I struggled

[@alishevas]

Thank you so much! Amazing explanations

[@kholaahmad835]

Thank you so much for making this video

[@fake2044]

for Q1 part v) we cant use the relationship where I is directly proportional to f² ?

[@Veritasim]

does amplitude changes at 16:55 plz tell

[@angana8652]

amplitude changes if a (slit seperation width) is changing, so yes amplitude changes. also because if x (fringe separation) and D (distance between slit separation and screen) stays the same, then a has to change for wavelength to change, thus changing intensity.

[@dracostuff_292]

21:36 why is it maxima

[@fake2044]

a

[@RajSharma-ed5xz]

Um 22 mm or 22cm ?

[@ETphysics]

Ah yes, it should be 22mm! For some reason the wrong prefix was written but the final answer was correct 😂

[@RajSharma-ed5xz]

@@ETphysics can this happen in exam🤣?

[@ETphysics]

Hahahaha it might depend on where the marks are awarded! If C1 is awarded for correct substitution in working, then one mark lost :')

[@RajSharma-ed5xz]

@@ETphysics indeed it would be painful🥴. Ma'am i have to say this. Your channel has boosten my confidence a lot. Your lessons are blessings. With this confidence im going to appear the physics As exam this ON session.. I just had to say thank you. Miss Elle and Miss Lee you make physics nice,simple and fun ❤

[@trigobrooken6260]

@@RajSharma-ed5xz When is your exam?