Biology; Chemistry; Physics: Post your doubts here!

[funky brat]

What is parallax error? And how to remove it?

Why do we time 20 oscillations instead of just one?

Parallex error occurs due to the wrong placement of eye. We can remove it by placing the eye vertically above the mark being read.
We time 20 oscillations, to make our results accurate. Timing one oscillation will result in the greatest human reaction time, so when we time 20 oscillations and then divide by 20, the error is minimised.

 

[Dark Destination]

H

Parallex error occurs due to the wrong placement of eye. We can remove it by placing the eye vertically above the mark being read.
We time 20 oscillations, to make our results accurate. Timing one oscillation will result in the greatest human reaction time, so when we time 20 oscillations and then divide by 20, the error is minimised.

In some questions they ask to mark the placement of eye. Where exactly should the eye be placed when measuring the time for oscillations?

 

[Awesome12]

View attachment 41019

Awesome12

Thanks

 

[funky brat]

H


In some questions they ask to mark the placement of eye. Where exactly should the eye be placed when measuring the time for oscillations?

You should it place it like if it's a pendulum, your eye should be in the centre so that it can see clearly when pendulum moves to and fro.

 

[***amd***]

H


In some questions they ask to mark the placement of eye. Where exactly should the eye be placed when measuring the time for oscillations?

just vertical to the orginal position of the pendulum.
and for paralyx error, see pg. 4 of federal.

 

[funky brat]

M/J 13 variant 62 for Biology has been the easiest paper, I hope we get one like this too.

 

[***amd***]

yeah

M/J 13 variant 62 for Biology has been the easiest paper, I hope we get one like this too.

, vvvvvv eaaaaaaaaaaaaaaaasy

 

[Dark Destination]

In Physics ATP there is always a general pattern. The first question is around 12-13 marks, with a graph, and a table. Plotting the graph, and drawing a curve of best fit.
And then there are 3 small questions.

But unlike Chemistry ATP, the questions are always different, and there are always different scenarios.
But similar concepts like Parallax error, timing 20 oscillations, taking averages.

 

[funky brat]

In Physics ATP there is always a general pattern. The first question is around 12-13 marks, with a graph, and a table. Plotting the graph, and drawing a curve of best fit.
And then there are 3 small questions.

But unlike Chemistry ATP, the questions are always different, and there are always different scenarios.
But similar concepts like Parallax error, timing 20 oscillations, taking averages.

Every student can do these things. But only those confusing questions decide what your score is.

 

[***amd***]

In Physics ATP there is always a general pattern. The first question is around 12-13 marks, with a graph, and a table. Plotting the graph, and drawing a curve of best fit.
And then there are 3 small questions.

But unlike Chemistry ATP, the questions are always different, and there are always different scenarios.
But similar concepts like Parallax error, timing 20 oscillations, taking averages.

curve of best fit? didnt you read in ms that curve should cover ALL the points? or am i wrong here?

 

[Awesome12]

curve of best fit? didnt you read in ms that curve should cover ALL the points? or am i wrong here?

:EPIC FACEPLAM:

 

[Dark Destination]

Every student can do these things. But only those confusing questions decide what your score is.

Yeah

 

[Dark Destination]

curve of best fit? didnt you read in ms that curve should cover ALL the points? or am i wrong here?

It's impossible to past through all points. I tried.

 

[funky brat]

curve of best fit? didnt you read in ms that curve should cover ALL the points? or am i wrong here?

Not at all.

 

[***amd***]

:EPIC FACEPLAM:

what now?

 

[***amd***]

Not at all.

oh, then it must be chem

 

[Awesome12]

It's impossible to past through all points. I tried.

You make a curve of best fit that passes centrally through points

 

[Dark Destination]

You make a curve of best fit that passes centrally through points

But some of the points are not in the same flow, don't we have to ignore those?

 

[Awesome12]

But some of the points are not in the same flow, don't we have to ignore those?

What do you mean? Check the previous pages, i posted a crve of best fit in response to asadalams post

 

[Dark Destination]

What do you mean? Check the previous pages, i posted a crve of best fit in response to asadalams post

Sometimes, all the points don't come in that flow. If we pass through all of them, it gets distorted and doesn't look smooth.
They ask for a smooth best fit curve