Question

1. State two differences between a chemical change and a nuclear change. [2]
2. Compare the ionizing power of α, β and γ radiations. [2]
3. State the nature of infrared and γ-rays. How do they differ in their (i) wavelength, and
(ii) penetrating power? [2]
4. State two similarities and two dissimilarities between the γ-rays and X-rays. [4]
5. a) State three properties which are common to both the beta rays and cathode rays.
b) How do beta rays differ from cathode rays? [3]
6. A radioactive sample is kept at the centre of an evacuated spherical vessel.
a) Out of the α, β and γ radiations which are (i) safe and (ii) unsafe.
b) Suggest two ways for more safety.
c) Does evacuation of vessel help in safety? [3]
7. a) Name the radiations which are deflected by the electric field.
b) Name the radiation which is most penetrating? [2]
8. State the speed of each of α, β and γ radiations. [2]
9. a) What is the composition of α, β and γ radiations?
b) Which one α, β and γ radiation has the least penetrating power? [2]
10. What happens to the position of an element in the periodic table when its nucleus
emits.
(a) an α-particle, (b) a β-particle and (c) γ-radiation? Give reason for your answer. [3]
11. a) An atomic nucleus A is composed of 84 protons and 128 neutrons. The nucleus A
emits an α-particle and is transformed into a nucleus B. What is the composition
of B?
b) The nucleus B emits a β-particle and is transformed into a nucleus C. What is the
composition of C?
c) What is the mass number of the radiation A? [3]
12. A nucleus is β-radioactive.
a) What are the numbers 24 and 11 called?
b) Write the equation representing β-decay.
c) What general name tis given to the product nucleus with respect to
? [3]
13. A nucleus of stable phosphorus has 15 protons and 16 neutrons.
a) What is its atomic number and mass number?
b) The nucleus of radio phosphorus has one neutron more than the stable nucleus.
What will be its atomic number and mass number?
c) What will be the atomic number and mass number of new nucleus formed by the
decay of a β-particle by the radio phosphorus in part(b)? [3]
14.
15. What do you mean by background radiations? Name its two sources. Is it possible
[3] for us to keep ourselves away from it? [3]

Answer 1

Answer:

wow so long i like it hehe