Describe the process that causes a massive star to become a supernova
What will be an ideal response?
A massive star will follow the same steps of hydrogen core burning, hydrogen shell burning, helium core burning and helium shell burning that a medium mass star will. A massive star will build up carbon in its core, and eventually reach a temperature where the carbon will fuse. The carbon will produce neon and oxygen as a byproduct. Eventually the core temperature will reach a point where these elements can fuse. This process continues until the star produces iron in its core. Iron nuclei are produced through silicon fusion. Iron does not produce energy when it fuses. When iron fusion begins, no energy is produced to support the rest of the star and the core collapses quickly. A shock wave propagates through the star, and a massive burst of neutrino energy ejects the outer layers of the star in a supernova explosion.
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If in Compton scattering of X-rays from a metal, the wavelength increases by 5% at an angle of 60°, what was the original wavelength before scattering?
What will be an ideal response?
A flat square coil of wire with 15 turns and an area of 0.40 m2 is placed with the plane of its area parallel to a magnetic field of 0.75 T
The coil is flipped so its plane is perpendicular to the magnetic field in a time of 0.050 s. What is the magnitude of the average induced emf in the coil? A) 6.0 V B) 36 V C) 45 V D) 90 V
Where do we find our Sun on the H-R diagram?
A) near the middle of the main sequence B) at the far upper left of the main sequence C) with the red giants D) at the far lower right of the main sequence E) with the white dwarfs
If someone tells you they have a sample of niobium-90, can you tell how many neutrons are in the nucleus?
a. Yes, there are 41 neutrons. b. Yes, there are 90 neutrons. c. Yes, there are 49 neutrons. d. No, more information must be given. e. No, there is no such thing as "niobium.".