Physics Unit 4 JUNE 11/6/12

[étudiante]

ya

From Astrophysics? thats the one I just did right?

 

[*Sandra*]

From Astrophysics? thats the one I just did right?

ohh sry i meant 23 is tht required 4 us?

 

[étudiante]

ohh sry i meant 23 is tht required 4 us?

I dont think i've seen nething like this before :S

 

[*Sandra*]

I dont think i've seen nething like this before :S

i'll nt solve it me neither i thnk its nt 4 our syllabus astrophysics is a bit confusing isn't it?like u kno the answers bt like smetimes i jst ans them and im nt fully understood the concept

 

[étudiante]

i'll nt solve it me neither i thnk its nt 4 our syllabus astrophysics is a bit confusing isn't it?like u kno the answers bt like smetimes i jst ans them and im nt fully understood the concept

Yeah i guess
N VERY true :| Even if u know it, u dunno how to explain it properly sumtymz

 

[*Sandra*]

Yeah i guess
N VERY true :| Even if u know it, u dunno how to explain it properly sumtymz

jst nw it happned wth me i wanna ask u the wavelength we receive frm a star i red shifted incomparsion 2 1 in the laboratory so the wavelength is the peak wavelength or no?

 

[étudiante]

jst nw it happned wth me i wanna ask u the wavelength we receive frm a star i red shifted incomparsion 2 1 in the laboratory so the wavelength is the peak wavelength or no?

It always keeps happening with me
I dint get u sorry What are u asking again?

 

[*Sandra*]

It always keeps happening with me
I dint get u sorry What are u asking again?

the wavelength we receive frm a galaxy is the peak wavelength always likein the redshift they show u a shift in a certain wavelength is tht the peak 1?.

 

[étudiante]

the wavelength we receive frm a galaxy is the peak wavelength always likein the redshift they show u a shift in a certain wavelength is tht the peak 1?.

We recieve a range of wavelengths from the galaxy acctually (remeber the bell-shaped curve for Wien's displacement Law?)
and its not nessecary that it's ALWAYS the peak one, all the wavelengths will show the same shift.

 

[*Sandra*]

We recieve a range of wavelengths from the galaxy acctually (remeber the bell-shaped curve for Wien's displacement Law?)
and its not nessecary that it's ALWAYS the peak one, all the wavelengths will show the same shift.

ahh ok and i shldn't confuse ths wth the previous parts as i always does

 

[étudiante]

ahh ok and i shldn't confuse ths wth the previous parts as i always does

well, usually the parts are related tho

 

[*Sandra*]

well, usually the parts are related tho

i don kno wat 2 say im really embarressed frm asking alot nw i answered 1 que and i found my ans wrng so can u explain it 2 me if tht's ok astrophysics as usual old papers Q88 last part abt speed calculation and Q87 and i repeat my apology

 

[étudiante]

i don kno wat 2 say im really embarressed frm asking alot nw i answered 1 que and i found my ans wrng so can u explain it 2 me if tht's ok astrophysics as usual old papers Q88 last part abt speed calculation and Q87 and i repeat my apology

Its perfectly okay with me Dont feel so, I'm learning a lot myself

Q87 I dunno what formula they are using I used a = v^2/r but I'm not getting the answer :S
@87 which part?

Dont apologize please I'm sorry for my late responses btw

 

[*Sandra*]

Its perfectly okay with me Dont feel so, I'm learning a lot myself

Q87 I dunno what formula they are using I used a = v^2/r but I'm not getting the answer :S
@87 which part?

Dont apologize please I'm sorry for my late responses btw

thnx all of it if u can

 

[étudiante]

thnx all of it if u can

Welcome n sure ...

Red Giants are stars with a large surface and cooler. They have moved off the main sequence.
Parallax displacement is the apparent change in angle of a star when viewed from the earth six months apart compared to a distant fixed star.

5 days (1 wave)

B is more luminous than A when viewed from earth. The maxima and minima are higher for B

Since luminosities are same, yet B appears brighter, A must be farther away from the earth to appear less brighter.

Contract: Gravitational forces
Expand: forces due to gas pressure and nuclear reaction

 

[*Sandra*]

Welcome n sure ...

Red Giants are stars with a large surface and cooler. They have moved off the main sequence.
Parallax displacement is the apparent change in angle of a star when viewed from the earth six months apart compared to a distant fixed star.

5 days (1 wave)

B is more luminous than A when viewed from earth. The maxima and minima are higher for B

Since luminosities are same, yet B appears brighter, A must be farther away from the earth to appear less brighter.

Contract: Gravitational forces
Expand: forces due to gas pressure and nuclear reaction

thnx bt y B is more luminous? and how distances can be diff?

 

[étudiante]

thnx bt y B is more luminous? and how distances can be diff?

No problem

B is as luminous as A according to the question, but from the earth it seems less brighter. That can only happen if B is far. LIke if u have something far it seems less bright than if it were near

How much are u done with? I'm doing Past papers now

 

[*Sandra*]

No problem

B is as luminous as A according to the question, but from the earth it seems less brighter. That can only happen if B is far. LIke if u have something far it seems less bright than if it were near

How much are u done with? I'm doing Past papers now

ok y b according 2 the graph is more luminous im also doin past papers bt i didn yet revise the bok and sme ques i solved b4 nw im nt able 2 solve and i started taking more time in solving ques than usual

 

[étudiante]

ok y b according 2 the graph is more luminous im also doin past papers bt i didn yet revise the bok and sme ques i solved b4 nw im nt able 2 solve and i started taking more time in solving ques than usual

It 'appears' more luminous but it isnt. Thats exactly what ís the reason for it being far away.



ahan! I did the Study Guide and now the papers... n i think its cuz of exam pressure... >.<" Its hard to do stuff when ur tensed n nervous

 

[*Sandra*]

It 'appears' more luminous but it isnt. Thats exactly what ís the reason for it being far away.



ahan! I did the Study Guide and now the papers... n i think its cuz of exam pressure... >.<" Its hard to do stuff when ur tensed n nervous

ya and smetimes u ned 2 thnk of an ans and the time is jst running away