Multiple Choice (Compiled Answers) (1 Viewer)

[juber]

Originally posted by bob_the_catdog
b
a
b
a
d
b
d
c
c
a
b
d
d
d
a

i'm fairly confident with all of my answers

Yes I agree with you.

I put the exact same as you so lets hope we get 15/15! YAY!

 

[Takuya]

So does everyone agree with my multiple choice answers?

 

[Constip8edSkunk]

well i just made that up but with 1 ring with a large enough gap, under UV light, u see sparking, no UV light, no sparking hence spark length decreases...

im just not convinced B answers the q, because it does not relate to teh photoelectric effect at all

 

[Belle]

Can I ask something...

With q. 5, does anyone know the twin paradox thingie where both points of view seem to be right? I figure that if the astronaut sees the clock on earth as <10 years, and the person on earth sees the clock in the space ship as <10 years, the whole thing is like the paradox. But it doesn't work that way coz only the spaceship is actually moving, so therefore the clock on earth is slower, therefore the answer is D.

Does anyone else get what I mean? That was my reasoning.

 

[Takuya]

Originally posted by juber
Yes I agree with you.

I put the exact same as you so lets hope we get 15/15! YAY!

The answer to 14 is b. Check my explanation above, straight out of the Jacaranda textbook.

 

[Ragerunner]

14 is D because B is not an observation.

 

[Bannanafish]

who says it has to do with photoelectric effect, the question was on hertz observations during his experiments, remember hertz didn't know it was the photoelectric effect

 

[Under-stated]

Originally posted by Takuya
Quoting p213 of Jacaranda:
"Glass used as a shield between the transmitting and receiving loops blocked the UV."

Correction Read the question: "Observation"

you cant conclude that UV were blocked by glasss sheet! So is it DEFINITELY not A or B.
And according to Jacaranda it is D, because it is an OBSERVATION.

 

[Takuya]

Oh shit.

 

[Constip8edSkunk]

which of the following observation is consistent with the photoelectric effect

how is glass blocking UV light consistent with the photoelectric effect. its more like a step in a procedure, or a explaination of the procedure.

Edit: actually rage runner has a better argument, B is not an observation

 

[Takuya]

Fuck this English language.

Anyway I aced the rest of the paper.

 

[Bannanafish]

well at least hertz did b, he observed the affects, obviously didnt' directly observe uv light being absorbed

hertz never did d

 

[walla]

Originally posted by Bannanafish
5 is b, go read the q again
its from the astronaought perspective of the clock on earth so it must be <10 years

do you even know what relativity is?
to someone on earth, activity on the spaceship looks slow. to someone of the spaceship, activity on earth looks slow. hence clock on earth > 10 to the astronaut

 

[walla]

and i understand that general relativity comes into play because accelerating the craft would involve non-inertial frames of reference but i didn't take that into account because its not in the syllabus and the question referred to one relative velocity.

 

[Bannanafish]

er.... on spaceship the time takes 10 years, if he looks at the earth clock, it runs slow, so therefore <10 years

 

[McLake]

Multiple Choice

Here is a table of results generated by the reponses in the other thread.

Partial answers list DO NOT show up in this table:

http://www.cse.unsw.edu.au/~mrla036/Physics.htm

EDIT: LAST UPDATED 1st Nov

 

[Constip8edSkunk]

Originally posted by Bannanafish
well at least hertz did b, he observed the affects, obviously didnt' directly observe uv light being absorbed

hertz never did d

put it this way what was the consequence of hertz doing B, he put the glass between the emitter and receiver, and the sparking greatly reduced or even stopped... what does this mean, max sparking distance decreased. thats what i thought.

 

[smeyo]

Originally posted by Belle
Can I ask something...

With q. 5, does anyone know the twin paradox thingie where both points of view seem to be right? I figure that if the astronaut sees the clock on earth as <10 years, and the person on earth sees the clock in the space ship as <10 years, the whole thing is like the paradox. But it doesn't work that way coz only the spaceship is actually moving, so therefore the clock on earth is slower, therefore the answer is D.

Does anyone else get what I mean? That was my reasoning.

yeah i did the same thing so really it should be d... ill check with my tutor about it mainly the questions in contention, 5 and 14

 

[new1]

thanx d00d, thats cool

from that i got 14/15 - im happy

 

[Bannanafish]

the twins paradox involves teh astronaut to come back to earth, this question doesn't have that

earth views the spaceships clock as slower
spaceship view earths clock as slower

spaceship has 10 years, therefore spaceship looking at earths clock is <10years