Physics: Post your doubts here!

[hellodjfos;s'ff]

Are you applying to Cambridge or Imperial college? You can get in easily.

I am not, I am looking to apply to US. People keep saying that to me, but those expectation are too high bro

 

[fatima_jawed]

IT was easy . what about you

What was your first reading for x and second reading for x in the second experiment?

 

[dwightedknight]

I am not, I am looking to apply to US. People keep saying that to me, but those expectation are too high bro

Really? I find US universities more difficult to get into.

It might be easier for you if you do 4 A levels though.

 

[angryrider_56]

Guys check the page @threesciencesforalevel on insta...
You'll be surprised at what you will find. Unfortunately, I just got to see it now :"(

 

[Tajrina Promela]

I thought the answer was C but it’s not, it’s D. Can anyone explain how it’s D, please?

 

[hellodjfos;s'ff]

View attachment 63893 I thought the answer was C but it’s not, it’s D. Can anyone explain how it’s D, please?

When quantities are being added or subtracted, you always add the absolute uncertainties. You get an absolute uncertainty of 0.03 m in (P-Q). Then apply (absolute uncertainty/value)*100. You get 6.8% which rounds to 7%, hence the answer being D.

 

[A*****]

Plz help

 

[Kanekii]

View attachment 64046 View attachment 64047 View attachment 64048 View attachment 64049
View attachment 64050

Plz help

12A since it can be clearly seen as the depth increases the magnitude of the pressure exerted increases.
29D The degree of diffraction increases as the narrower the slit/gap width gets and higher the wavelength gets. however since angle of diffraction is lower it must have lower degree of diffraction for this its wavelength needs to decrease and the slit width needs to get higher e.g 2x
wavelength= v/2f (inversely proportional to frequency)

 

[Kanekii]

Can someone explain this?

 

[A*****]

12A since it can be clearly seen as the depth increases the magnitude of the pressure exerted increases.

Why not C or D??

 

[A*****]

Can someone explain this?View attachment 64051

3 boxes = 0.006s
1 box= 0.006/3 = 0.002s = 0.002x 1000 = 2ms

 

[Kanekii]

Why not C or D??

For D pressure in sides is not increasing with depth and remains the same
For C the pressure of the top sides arrow is really low even when we know object is fully submerged so it should be greater as it already has higher depth.
Remember pressure exerted by water is in all directions.

 

[A*****]

For D pressure is not increasing with depth and remains the same
For C the pressure of the top sides arrow is really low even when we know object is fully submerged so it should be greater as it already has higher depth.
Remember pressure exerted by water is in all directions.

Do u mean the sideways pressure? It also increases with depth?

 

[Kanekii]

Do u mean the sideways pressure? It also increases with depth?

Yes, Precisely.

 

[A*****]

Can u plz answer 8 14 28 as well?

Yes, Precisely.

 

[Kanekii]

Can u plz answer 8 14 28 as well?

Is 28C?

 

[A*****]

Is 28C?

Yeah

 

[Kanekii]

Yeah

Oh didnt expect that honestly xD
Im not sure but i think both P and Q would have no path difference at RS and would only have at XY

 

[A*****]

Oh didnt expect that honestly xD
Im not sure but i think both P and Q would have no path difference at RS and would only have at XY

Oh well yesss this can be a possibility as the question asks about INTERFERENCE PATTERN, so it would only be visible at XY and at RS only constructive interference will occur...no destructive for the pattern
Righttt!

 

[Kanekii]

Something like this i assume