AQA AS 2020 Paper 2 - AS-level Physics Past Paper

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00:00 Q1 - Refraction & uncertainties
05:07 Q2 - EMF & internal resistance graph analysis
09:11 Q3 - Forces & optical fibre
14:01 Q4 - Scintillator - electrons & de Broglie wavelength
19:16 Multiple choice -
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[lolaharwood]

Watching this as some final revision for my as 2 exam tomorrow, always love your videos they're so helpful !!

[jefferyjimson]

can anyone tell me - will an atom with electrons vibrating at 430tv (red light frequency) only absorb red light then emit a red light photon and photons with other frequencies are absorbed and converted into heat energy?

[djchild]

At 6:35, the gradient of the line is neagtive, so to get the minimum possible gradient shouldn't the gradient be the most negative gradient hence would be the steepest possible line through the error bars and not the shallowest?

[jefferyjimson]

how to objects stay the same colour - if the frequency of the re-emitted photon is dependent on the frequency of the photn the electron absorbed, how does an atom continuously produce a photon of the same colour/ why is an atoms colour constant?

[husseinharb]

Thank you for all your work sir, but when will we see a face reveal?

[suudoakira]

for multiple choice question 12, how come z is not the wavelength as well?

[igig]

18:04

Is there really no other way to solve this question without counting the squares? How that is a viable/efficient method at all is completely beyond me. AQA needs to remove these type of questions as they're a complete waste of time