Fission fragments are
A. harmless particles emitted in radioactivity
B. among the most dangerous kind of radiation
C. ghost-like particles that pass through the Earth
D. the source of most energy in the Sun
Answer: B. among the most dangerous kind of radiation
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Suppose the entire solar nebula had cooled to a very low temperature before the solar wind cleared it away. Do you think Earth would be the same? Why or why not?
What will be an ideal response?
Why do molecular bands only occur in the spectra of the coolest stars?
What will be an ideal response?
Spherical Mirrors: An object is 50 cm from a concave mirror of radius of curvature of magnitude 60 cm. How far is the image from the mirror?
A. 19 cm B. 35 cm C. 60 cm D. 75 cm E. 120 cm
Why does the Main Sequence part of a star's life end?
A: Much of the mass of the star has evaporated B: The Hydrogen in the core is exhausted C: The Helium in the core is exhausted D: The temperature drops so that nuclear reactions are no longer possible E: The gravitational force is no longer large enough to balance the pressure