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A sealed radioactive sample contains undecayed nuclei at time Figure 1 shows how changes with time.
Use Figure 1 to state the number of undecayed nuclei at and at
Using your values from (a) and the radioactive decay law determine the decay constant Give its unit.
Determine the number of undecayed nuclei in the sample at Use the decay law and your value of from (b).
Figure 1 is a schematic Hertzsprung–Russell (HR) diagram. The regions are labelled A–D, and the positions of the Sun and star X are shown.
Identify the stellar type represented by each of the regions A, B, C and D in Figure 1.
Using Figure 1, compare the surface temperature and luminosity of star X with those of the Sun.
Stars P and Q are both on the main sequence. P has a greater mass than Q. State which star has the shorter main-sequence lifetime.
State the likely final remnant of a low-mass star and of a high-mass star.
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