What defines the main-sequence lifetime of a star? a. Thermonuclear fusion of He
ID: 1791246 • Letter: W
Question
What defines the main-sequence lifetime of a star?
a. Thermonuclear fusion of He into C in the core
b. Thermonuclear fusion of H into He in the core
c. An electron degenerate pressure state in the core
d. Thermonuclear fusion of He into C in the shell
e. Thermonuclear fusion of H into He in the shell
What is the first indication that we receive on the Earth that a Supernova explosion has happened somewhere in the sky?
a. A pulsar is detected
b. The Aurora are exceptionally bright
c. A handful of neutrinos are detected
d. Radio signals are interrupted
e. We see the light from the supernova
Explanation / Answer
ANSWER
b Thermonuclear fusion of Hydrogen into Helium.
2 c Neutrinos are detected
e) we see light (spectrum ) from supernova.
Fusion reactions are thermonuclear reactions that occur in the main sequence stars.
Supernova is the explosion of a star .They release a burst of neutrinos which are detected by the respective neutrino detection centers.
Supernova early warning system can identify by studying the burst of neutrinos that result from it.