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Radioactivity: Physics Class - X (ICSE)

The document covers key concepts of radioactivity for Class X (ICSE), including the structure of atomic nuclei, types of radiation (α, β, γ), their properties, and the processes of radioactive decay. It includes questions on the characteristics of radiations, the effects of decay on atomic and mass numbers, and the relationship between radioactive substances and their behavior. Additionally, it addresses the impact of oxidation on radioactivity and requires students to perform calculations related to decay sequences.

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886 views2 pages

Radioactivity: Physics Class - X (ICSE)

The document covers key concepts of radioactivity for Class X (ICSE), including the structure of atomic nuclei, types of radiation (α, β, γ), their properties, and the processes of radioactive decay. It includes questions on the characteristics of radiations, the effects of decay on atomic and mass numbers, and the relationship between radioactive substances and their behavior. Additionally, it addresses the impact of oxidation on radioactivity and requires students to perform calculations related to decay sequences.

Uploaded by

vidyamane23
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Radioactivity : Physics Class – X ( ICSE)

1. What is the nucleus of an atom? Compare its size with that of the atom. Name
its constituents. How is the number of these constituents determined by the atomic number
and mass number of an atom?

2. State the atomic number and mass number of and draw its atomic model.

3. Arrange the α, β and γ radiations in ascending order of their (i) ionizing power, and (ii)
penetrating power. State the speed of each of α, β and γ radiations.

4. Is it possible to deflect γ radiations in a way similar to α and β particles, using the electric
or magnetic field? Give reasons.

5. A radioactive source emits three types of radiations.


(a) Name the three radiations.
(b) Name the radiations which are deflected by the electric field.
(c) Name the radiation which is most penetrating.
(d) Name the radiation which travels with the speed of light.
(e) Name the radiation which has the highest ionizing power.
(f) Name the radiation consisting of the same kind of particles as the cathode rays.

6.What is meant by radioactivity? Name two radioactive substances.

7.A radioactive nucleus undergoes a series of decays according to the sequence X 
X1  X2  X3 If the mass number & atomic number of X3 are 172 & 69
respectively, what is the mass number & atomic number of X.

8. An element ZSA decays to 85R222 after emitting 2 α particles and 1 β particle. Find the
atomic number and atomic mass of the element S.

9. 11Na24 emits a beta particle to change into Mg. (i) Write the symbolic equation for the
process. (ii) What is the general name of 12Mg24 with respect to 11Na24?
10. A radioactive substance is oxidized. Will there by any change in the nature of its
radioactivity? Give reason.

11. Arrange α, β and γ in ascending order with respect to their: (i) Penetrating power (ii)
Ionizing power (iii) Biological effect

12. A radioactive nucleus undergoes a series of decays according to the sequence: X → X1 +


β → X2 + α → X3 + α If the mass number and atomic number of X3 are 172 and 9
respectively, what is the mass number and atomic number of X?

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