Why does conversion of its core to iron have to mark the end of a star's life? Which stars can end up with iron cores?
What will be an ideal response?
Stars with a total mass of 8 solar masses or more may form iron cores. The formation of an iron core ends the normal life of a star because iron cannot be fused into heavier elements and produce energy, as previous fusion reactions have done. In order to fuse iron, energy must be provided. The star, at this point in its evolution, has finally run out of energy sources in its core. This disrupts the hydrostatic equilibrium of the star; the inward pressure of gravity takes over and the star collapses and then explodes as a Type II supernova.
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Water ripples are produced by making a cork oscillate up and down at a frequency of 5 Hz. The peaks of the ripples are 0.03 meters apart. What is the speed of the water ripples?
A generator is designed to produce a maximum emf of 170 V while rotating at 3200 rpm. The coils of the generator are circular with diameter 7.5 cm. Assuming the magnetic field in the generator is 0.075 T, what is the number of loops needed in the generator coil?
A. 160 B. 1530 C. 6120 D. 4810 E. 25
A high-pressure air mass that moves over a region and then becomes stationary may give rise to a(n) ______________ inversion
Fill in the blank(s) with correct word
A reflection nebula appears blue because it scatters the ________ light of the stars near it
Fill in the blank(s) with correct word