Space
, ① Intensity and Luminosity
·
Luminosity
(L) : is the rate of light energy released or power output of a star.
·
Intensity (1) : is the luminosity per unit crea from star a
I :
intensity
Unit= Wm-2
=
-
Luminosity
I d = distance from source (star)
·
Intensity follows the inverse square low meaning it is
inversely proportional
to the square of the distance between the star and observer .
·
A standard candle is an object of known
luminosity Ce g .
. .
Cepheid variable stars
You can measure astronomical distances by the intensity detected
measuring
-
from the light source on Earth and using the inverse square lamequation :
L
d
-
= 4 I
, ① Intensity and Luminosity
·
Luminosity
(L) : is the rate of light energy released or power output of a star.
·
Intensity (1) : is the luminosity per unit crea from star a
I :
intensity
Unit= Wm-2
=
-
Luminosity
I d = distance from source (star)
·
Intensity follows the inverse square low meaning it is
inversely proportional
to the square of the distance between the star and observer .
·
A standard candle is an object of known
luminosity Ce g .
. .
Cepheid variable stars
You can measure astronomical distances by the intensity detected
measuring
-
from the light source on Earth and using the inverse square lamequation :
L
d
-
= 4 I
