[ 3 / biz / cgl / ck / diy / fa / ic / jp / lit / sci / vr / vt ] [ index / top / reports ] [ become a patron ] [ status ]
2023-11: Warosu is now out of extended maintenance.

/sci/ - Science & Math

View post   
File: 3 KB, 429x410, 1318339701370.png [View same] [iqdb] [saucenao] [google]
4105393 No.4105393 [Reply] [Original]

TTwo stars A and B emit most of their light at the wavelenghts of 650nm and 480 nm respectively. If it is known that star A has twice the radius of star B, find the ratio of the luminosities of the stars.

guys, help. this is the last question that is keeping me from sleep

>> No.4105418

No.

>> No.4105436

>>4105418
its Astrophysics :3

>> No.4105443

5:46pm

>> No.4105467 [DELETED] 

>this is the last question that is keeping me from sleep
ask again at midnight if you still cannot solve it

i'll only do it then

>> No.4105470

>4105467
dude its 2 am herehere

>> No.4105490

>>4105470
eh, im off to bed, gonna try tommorow

>> No.4105544

I just looked this up despite never having studied any astrophysics, and have found the answer.
Or, rather, I've found the forumlae and calculated it.

>> No.4105600

use Wien's displacement law
(lamda max)*(temp)=2.9*10^-3

then
L=4*pi*R^2*sigma*T^4
where T is the temperature you calculated and sigma is the stefan-boltzmann constant and R is the radius).

divide La by Lb
(La/Lb)=(Ra/Rb)^2*(Ta/Tb)^4
Ra=2*Rb
sub in the values to get La/Lb

>> No.4106798

>>4105600
dude i fucking love you