How was Physics P42

[Mukit-ul Islam]

Do you remember the given data for the bits question?

sampling frequency 44100 Hz, 16 bit system, music played for 5 min 40 sec

 

[Taci12]

sampling frequency 44100 Hz, 16 bit system, music played for 5 min 40 sec

thanks, so t= (5x60)+ 40 = 340 s

no of bits per sample = 16
no of samples per sec= 44100 Hz
total no of bits = 44100 x 16 x 340 = 2.40 x 10^8 bits

I think it was 44.1 KHz, not 44100 KHz. Is this what you did too?

 

[Mukit-ul Islam]

thanks, so t= (5x60)+ 40 = 340 s

no of bits per sample = 16
no of samples per sec= 44100 Hz
total no of bits = 44100 x 16 x 340 = 2.40 x 10^8 bits

I think it was 44.1 KHz, not 44100 KHz. Is this what you did too?

lol. i did exactly that! yes i wrote 44100 Hz which is 44.1 Khz.

 

[manu94]

Besides the comparator, I got the same answers! For the reasons, there is also the fact that the photo-current or rate of emission of electrons increases linearly with increasing intensities of incident radiation.

The question on the graph of a comparator is an exact copy of the mj12 variant 2 question.
There are many reasons for the photo-electric question however you cannot mention that "Emission is instantaneous" as the question already said that.

 

[Taci12]

lol. i did exactly that! yes i wrote 44100 Hz which is 44.1 Khz.

My eyes playing tricks on me Atleast I got it right for the exams!

 

[Taci12]

The question on the graph of a comparator is an exact copy of the mj12 variant 2 question.
There are many reasons for the photo-electric question however you cannot mention that "Emission is instantaneous" as the question already said that.

Yes, i've seen the famous Ah-Shun post : P I did not mention the spontaneous emission, just these 3 points;
1. Photocurrent proportional to intensity
2. Max kinetic energy of emitted electrons independent of intensity of incident light/radiation, but dependent on frequency of radiation.
3. Threshold frequency

I love this chapter in Physics. I wish we also studied Quantum Physics, but I guess the math is too far beyond the realms of A-level.

 

[W-inx]

Yes, i've seen the famous Ah-Shun post : P I did not mention the spontaneous emission, just these 3 points;
1. Photocurrent proportional to intensity
2. Max kinetic energy of emitted electrons independent of intensity of incident light/radiation, but dependent on frequency of radiation.
3. Threshold frequency

I love this chapter in Physics. I wish we also studied Quantum Physics, but I guess the math is too far beyond the realms of A-level.

I love this chapter too and yet i failed to write all the 3 reasons well -.- I know the answer, I forgot them cuz of stress

 

[Taci12]

I love this chapter too and yet i failed to write all the 3 reasons well -.- I know the answer, I forgot them cuz of stress

Nevermind!I messed up the electronics part. I'm sure you did great

 

[alcoholic 111]

Mine was 1.0 x 10 ^8 J too change in Ek
it was 7.0 x 10^6 Km and 7.3 x 10 ^6Km make sure you converted Km to m

 

[Kumkum]

When you were asked to find the change in Ek did you guys find Ek with the first radius, then with the other radius and then subtracted one from the other...or did you just find the Ek with the last radius..?

 

[Mukit-ul Islam]

When you were asked to find the change in Ek did you guys find Ek with the first radius, then with the other radius and then subtracted one from the other...or did you just find the Ek with the last radius..?

yes, Ek with first radius and second radius...than the diff

 

[Kumkum]

yes, Ek with first radius and second radius...than the diff

ok thnx!

 

[W-inx]

Nevermind!I messed up the electronics part. I'm sure you did great

Hehe lol, I knew exactly wat to do in electronics, but instead of putting the sides as square i made them curvy and saturated at+-5 I hope i lose only 1 mark cuz i showed how it's saturated etc

 

[W-inx]

Mine was 1.0 x 10 ^8 J too change in Ek
it was 7.0 x 10^6 Km and 7.3 x 10 ^6Km make sure you converted Km to m

there was no Km, radius was in m.

 

[Taci12]

Hehe lol, I knew exactly wat to do in electronics, but instead of putting the sides as square i made them curvy and saturated at+-5 I hope i lose only 1 mark cuz i showed how it's saturated etc

Oh well, it's done now. Time to have fun with p5!

 

[W-inx]

Oh well, it's done now. Time to have fun with p5!

Ya I'll just rip this P5 and P1 now done too much silly mistakes in P4

 

[Taci12]

Ya I'll just rip this P5 and P1 now done too much silly mistakes in P4

That's the spirit!

 

[W-inx]

That's the spirit!

I just realised ur from Mauritius Ki lekol ?

 

[Taci12]

I just realised ur from Mauritius Ki lekol ?

Yep, Mauritian and almost proud to be : P I'm sorry, that's confidential!

 

[W-inx]

Yep, Mauritian and almost proud to be : P I'm sorry, that's confidential!

Lawl, Privacy, nice!