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

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.

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