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प्रश्न
What is meant by radioactivity?
उत्तर
The phenomenon of spontaneous emission of highly penetrating radiations such as α, β and γ rays by an element is called radioactivity.
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संबंधित प्रश्न
In alpha decay, why the unstable nucleus emits \[\ce{^4_2He}\] nucleus? Why it does not emit four separate nucleons?
What is half-life of nucleus? Give the expression.
Define curie.
Discuss the alpha decay process with example.
Discuss the properties of neutrino and its role in beta decay.
Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes respectively. Initially, the samples have equal number of nuclei. Calculate the ratio of decayed numbers of A and B nuclei after 80 minutes.
Calculate the time required for 60% of a sample of radon to undergo decay. Given T1/2 of radon = 3.8 days.
Characol pieces of tree is found from an archeological site. The carbon-14 content of this characol is only 17.5% that of equivalent sample of carbon from a living tree. What is the age of tree?
If T is the half-life of radioactive material, then the fraction that would remain after a time `"T"/2` is:
What percentage of original radioactive substance is left after 5 half-life time.
