IAL Physics January 2021

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For energy, mine was similar to you as I got 0.94 Joule.

And I rmb I also got a rather small value for alpha as you but could not rmb the exact value

I calculated the difference in area of loading and unloading and got 1.84 J 😬

Reply 81

AzimP

Original post by lokamakthyve

For energy, mine was similar to you as I got 0.94 Joule.

And I rmb I also got a rather small value for alpha as you but could not rmb the exact value

Yeah 0.94/0.95 is basically the same thing

Reply 82

Bap123

Original post by AzimP

The last question was weird, I got alpha to be 4.45*10^-3 / *C. For the energy thing, I counted 76 squares so 0.95J. For monochromatic light, I said that white light would create a light spectrum, so you would not know which ray to measure the angle, whereas light of single frequency will cause only one ray to be produced.

I got alpha about 3.89x10^-3 not sure if I made any mistake

Reply 83

lokamakthyve

Original post by Bap123

I got alpha about 3.89x10^-3 not sure if I made any mistake

Ah, your answer just reminded me that I got 3.94x10^-3 for alpha which was similar to yours

Reply 84

lokamakthyve

Original post by Bap123

I calculated the difference in area of loading and unloading and got 1.84 J 😬

Yes, that was the method and maybe there was just some variance when we counting the squares

Reply 85

AzimP

What did you guys put for the percentage uncertainty of the analogue voltmeter? The reading was 10.5V, did you put (0.5/10.5)*100 or (0.25/10.5)*100? I put the latter. I think it should be the former after thinking...

Reply 86

Bap123

Original post by AzimP

Did the former

Reply 87

AzimP

Original post by Bap123

Did the former

there goes one mark ;(

Reply 88

kavi_in

0.5 was the precison for the voltmeter as i remeber our sir telling you dont divide precision for digital stuff. btw i just realised ive messed the axes of the graph. so will i lose all 11 marks, ( 5 for graph and 6 for calculation. Could mean i d fail the unit. Really upset after working so hard for so long to mess a simple thing up. will i have to reapply/ did all other questions well though