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TheOnePheeph provided a brilliant explanation. Also remember @Faye19, changing the intensity only changes the amount of photoelectrons emitted (photocurrent), while changing the frequency corresponds to a change in the maximum kinetic energy (and hence stopping voltage).

Also, remember that for a normal DC motor, the torque is unidirectional, for this to happen the current must reverse every 180 degrees through the use of a split ring commutator as you already know. Now, this means when the current reverses direction, the force it exerts due to the motor effect...

Yes you are right. I confirmed this with my tutor.

I wish lol

Note that dark spots occur during destructive interference, that is, d\sin\theta=\left(m+\dfrac{1}{2}\right)\lambda Using this, we can see that it is a second order dark spot, so m=1 (this is because the first order dark spot occurs at exactly half of the path difference, i.e. m=0). Thus, we...

We are required to use the identities \dfrac{V_p}{V_s}=\dfrac{N_p}{N_s}=\dfrac{I_s}{I_p} To find the voltage in the secondary coil to Transformer 1, V_s=\dfrac{N_s}{N_p}\times V_p=\dfrac{1000}{500}\times240=120~V Now, in Transformer 2, this section behaves as the primary coil, hence...

If the gaps are 10-15% moderation shouldn’t be too bad, so if you do well in the HSC, it won’t be a big deal and should have little to no effect.

How you do it though is, since the conductor is being moved right point your thumb to the right (as the current moves right). Now the magnetic field points inward, so orient your fingers into the page. You notice now that there is a force induced up the page by using your right hand rule. This...

That was a stupidly worded q, i initially thought it was induction but its just RHR

Do the earlier papers first so you can save the newer ones for once you’ve done all the topics as practice tests.

Ok thats good, I swear if the HSC screws us over though hahaha

From what I can tell, you seem very competent. Don’t fret now, as there is nothing you can do to change it, just try your best in the exam. Also 3rd is a good rank, what’s your school rank by the way and the gaps between 1st .2nd and 3rd? I’m asking to analyse your moderation

Also did you say the position helps predict the formation of a black hole or supernova? Because the black hole arises from the supernova if the mass of the star is between 8-50 solar masses, otherwise it becomes a neutron Star. Other stars die by pulsating their outer layers out to form a...

That’s a good answer, you explored in detail how position affects energy production, luminosity and colour. I’d say that’s full marks

the atar notes topic test book covers it because there is a dot point exploring stellar classifications, but i dont think its super necessary, just an extra measure

Also I’m impressed you know this considering your HSC is in 2020. :)

Ah, but remember the MK system doesn’t just describe the usual OBAFGKM , it also has sub classes of luminosity (I-IV) (iirc) and temperature (0-9), e.g. the sun is a G2V star.

While I agree with you on the radiometric effect, the transfer of momentum also had a part to play. It may not be concrete evidence, but evidence nonetheless. Also, I would think delving into the radiometric would be too much for HSC physics.

Thats what i did but i didnt get 701.9 nm, rather 707.1 i believe

In summary: cathode rays were argued to be either waves or particles. Evidence for the particle nature: - when a paddle wheel was placed inside an evacuated CRT, the paddle wheel spun - implying the cathode rays had momentum and thus mass. - when cathode rays were passed through electric and...