PHYSICS EXAM 2 SUGGESTED SOLUTIONS

[Flaming_Arrow]

Electric power:
1. alternator
2. 8.0X10^(-3)T
3. 3.6X10^(-4)V
4. diagram
5. up
6. 0.0045N
7. 0 N
8.
9.1.00X10^4W
10. 4000W
11. 300V
12. 5000VRMS
13. 480 turns
14. 40.0W
15 498VRMS
16. T=0.040s, Vpeak=50V

Light and matter:
1. interference - wave property
2.
3. Thelma, same distance, constructive, bright
4. 496nm
5.
6. h=5.0X10^(-15)eVs, Work function=1.5V (no minus)
7. i) max k. e. not affected, ii) double
8. 8.9X10^3eV
9. 4.7X10^(-24)kgms-1
10.
11. first to second, first to third
12.Whole number of standing waves around nucleus.

Synchrotron
CBCBCDDBCBACB

Photonics
CCADBCBBBCBCA

Sound
BBCBCDCCBCAAA


got it from itute

[ngRISING]

LOOOOOOOOOL. I GOT 2 MC WRONG. HAHA. AWESOME (Y). your the best flaming arrows + itute.

[THem]

What's question 8? - Electric power

Whats question 2,5 and 10 of light?
edit: 2 - photoelectric effect?
5 - describing ekmax, w and f?
10 - bright band explanation?

[poppa]

for sound question 4, anyone 100 % sure the answer is B, not C?

[appianway]

The sound answer for question 4 is definitely B. Think about what the waveform behind the displacement of 0 (presuming it's a distance from the speaker when the displacement starts being measured anyway). Most people I know put down B, and my teacher said that the answer's B.

[poppa]

The sound answer for question 4 is definitely B. Think about what the waveform behind the displacement of 0 (presuming it's a distance from the speaker when the displacement starts being measured anyway). Most people I know put down B, and my teacher said that the answer's B.

thanks for the fast ans
i lost 2 marks there

[KeyMan]

Can someone explain why question 15 is 498RMS?

I got 480V for question 15.

P = VI
10000 = 5000I
I = 2.0A

V_drop = IR
= 2.0 * 10
= 20V

500 - 20 = 480V

[crappy]

Can someone explain why question 15 is 498RMS?

I got 480V for question 15.

P = VI
10000 = 5000I
I = 2.0A

V_drop = IR
= 2.0 * 10
= 20V

500 - 20 = 480V

You got 480V without the transformers Im guessing. The second part had transformers in it, so there is a massive difference in working D:

[/0]

You apply to the stepped-up voltage, since the voltage loss occurs where the voltage has been stepped up.
So the voltage delivered to the second transformer is

Then you step this down by 10x to get 498V

[KeyMan]

Ah damn it! Subtracted 20 from the wrong voltage

Thanks for explanation.

I should get 2 out of the 3 marks though yeh?

[nem0]

i dont see itute answers? are they even up?

[majo]

i think i only lost 5 marks. I did the loop for the solenoid the wrong way, feel like such a doosh bag

what do you guys think will be the a+ cutoff?

i think i lost between 5 and 8. depending on how good my explanation for question 2 of light and matter!