Answer:
Emission nebulea emit light
absorb
reflect
Explanation:
.
Answer:
K=6.250 J
Explanation:
m=500kg
v=m/s
Kinetic energy= ½mv²=½(500×25) J= 6.250 J
Answer:
100 times brighter
Explanation:
The apparent luminosity of a star follows the inverse square law, which means that the luminosity is inversely proportional to the square of the distance:
where r is the distance.
In this problem, star A and star B have same intrinsec luminosity, but star B is 10 times farther than star A:
We can write the luminosity of star A as follows:
While the luminosity of star B will be:
Substituting :
So, star A will appear 100 times brighter than star B.