Chapter 42: Q 7 Conceptual Question (page 1235)
What kind of decay, if any, can occur for the nuclei in
FIGURE Q42.7?
Short Answer
Hence, the decays which can occur are explained.
Chapter 42: Q 7 Conceptual Question (page 1235)
What kind of decay, if any, can occur for the nuclei in
FIGURE Q42.7?
Hence, the decays which can occur are explained.
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Stars are powered by nuclear reactions that fuse hydrogen into helium. The fate of many stars, once most of the hydrogen is used up, is to collapse, under gravitational pull, into a neutron star. The force of gravity becomes so large that protons and electrons are fused into neutrons in the reaction . The entire star is then a tightly packed ball of neutrons with the density of nuclear matter.
a. Suppose the sun collapses into a neutron star. What will its radius be? Give your answer in .
b. The sun's rotation period is now 27 days. What will its rotation period be after it collapses?
Rapidly rotating neutron stars emit pulses of radio waves at the rotation frequency and are known as pulsars.
A sample of 1.0x1010atoms that decay by alpha emission
has a half-life of 100 min. How many alpha particles are emitted
between t = 50 min and t = 200 min?
The doctors planning a radiation therapy treatment have determined that a 100 g tumour needs to receive 0.20 J of gamma
radiation. What is the dose in grays?
The half-life of the uranium isotope is million years. The earth is approximately localid="1650486537957" billion years old. How much more was there when the earth formed than there is today? Give your answer as the then-to-now ratio.
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