OCR B Physics H157/01 Fnd in Physics 24th May 2016

Original post by otah007

Yep 5600 and 3200 is right.

For the diodes, they only conduct one way above their forward bias voltage (0.4V, when the graph starts to go up) so by the time you reach 0.6V it's got a much lower resistance than the ammeter so most of the current flows through the diode.

When finding the wavelength of the electrons, did anyone actually get 0.7nm? Everyone I spoke to got 0.3-0.4 (I got exactly 0.35nm, exactly half!). What's up with that?

I wrote pretty much the same thing for the diodes with calculations but i didnt say that the current only flows in one direction. How many marks do you reckon i would get?

Reply 29

metasysta

OP

2

Original post by maryamkhawaja

whats the difference? The questions are similar...

The questions may be similar but they are not the same paper. The spec is different for a start and they are called different things.

Reply 30

I found it much harder than the sample and specimen paper. Not what I expect.

Reply 31

What did people put for the estimating questions on weight ect.

Reply 32

phoebeisgreat

5

what did people put for the last question? How would you calculate the terminal velocity with the first method?

Reply 33

Original post by swagmister

What did people put for the estimating questions on weight ect.

I put 2N but I think it should be 1N

Reply 34

Fetty_Wap

2

Hey what did everyone get for that question where you had to estimate the amount of bits used in the signal with the graph? i put 5 bits, is that right?

(edited 7 years ago)

Reply 35

Original post by JZ0120

I put 2N but I think it should be 1N

I legit guessed and wrote 0.49N those questions were weird, at least they were only one markers

Reply 36

Original post by swagmister

I legit guessed and wrote 0.49N those questions were weird, at least they were only one markers

I think I got all estimations wrong
I found this is a harder paper than SAM and specimen. I would possibly failed. :frown:

What did you got for the terminal velocity? As the acceleration is not constant how could we calculate it? All the suvat equations assume acceleration is constant.
What I have done was just to divide distance by time( can't think anything else)

Reply 37

Original post by JZ0120

I think I got all estimations wrong
I found this is a harder paper than SAM and specimen. I would possibly failed. :frown:

What did you got for the terminal velocity? As the acceleration is not constant how could we calculate it? All the suvat equations assume acceleration is constant.
What I have done was just to divide distance by time( can't think anything else)

I thought the acceleration was constant as 9.8 I can't remember what I got but I used s =0.5(u+v)t
I thought was alright but everyone's saying it was hard so I've either done really well or really badly 😕, dividing distance by time is when there's no acceleration

Reply 38