Classes

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Class 9Class 10First YearSecond Year

Math

Physics

10Simple Harmonic Motion And Waves

6720 Doubt Solutions

11Sound

7392 Doubt Solutions

12Geometrical Optics

8064 Doubt Solutions

13Electrostatics

8736 Doubt Solutions

14Current Electricity

9408 Doubt Solutions

15Electromagnetism

10080 Doubt Solutions

16Basic Electronics

10752 Doubt Solutions

17Information and Communication Technology

11424 Doubt Solutions

18Atomic and Nuclear Physics

12096 Doubt Solutions

Chemistry

18.6. In an experiment to measure the half-life of a radioactive element the following results were obtained:\begin{tabular}{|cccccc|}\hline Count rate / minute & 400 & 200 & 100 & 50 & 25 \\Time (in minutes) & 0 & 2 & 4 & 6 & 8 \\\hline\end{tabular}Plot a graph between the count rate and time in minutes. Measure the value for the half-life of the element from the graph.Ans. (half-life is 2 minutes)

$18.9. What is meant by background radiations? Enlist some sources of background radiations.$

$18.4. What is the difference between natural and artificial radioactivity?$

$18.7. What do you understand by half-life of a radioactive element?$

$18.12. Complete this nuclear reaction: { }_{92}^{2 s} U \longrightarrow{ }_{54} X+?+2{ }_{5} \mathrm{n} . Does this react involve fission or fusion? Justify your answer.$

$vii. Release of energy by the Sun is due to(a) nuclear fission(b) nuclear fusion(c) burning of gases(d) chemical reaction$

$18.7. How much of a 1 \mathrm{~g} sample of pure radioactive substance would be left undecayed after four half-lives?$

Class 10 Physics Atomic and Nuclear Physics