Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
A radioactive source emits three types of radiations. These are a
radiations, β and Y radiation.
α radiation
(i) a particles are He I iu m nucleus 2He4.
(ii) a particles are positively charged.
(iii) The mass of each a particle is 4 a. m. u.
(iv) Ionization power of a particle is maximum. It is about 100 times more than that of β particles.
(v) α particle has velocity less than the velocity of light i.e 1 x 107 ms-1.
(vi) The penetrating power of a particle is least.
(vii) a particles are less deflected by electric and magnetic fields.
β particles
(i) β particles are like electrons -1β°.
(ii) β particles are negatively charged.
(iii) The mass of each β particle is negligble.
(iv) Velocity of β particle is comparable to the velocity of light.
( v) Ionization power of β particle is about 100 times more than that of Y radiations.
(vi) Penetrating power of β particles is less but 100 times more than that of a particle.
(vii) β particles are more deflected by electric and magnetic field but in opposite direction.
Y radiations
(i) Y radiations a re electromagnetic radiations.
(ii) Y radiations have no charge.
(iii) Y radiations have no mass.
(iv) Velocity of Y radiation is equal to the velocity of light.
( v) Ionization power is least.
(vi)Y radiations have maximum penetration power. They are 100 times more penetrating than β particles.
(vii) Y radiations a re unaffected by electric and magnetic field.
Heavy nucleus undergo radioactivity because they are unstable.
APPEARS IN
संबंधित प्रश्न
A radiation X is focused by a particular device on the bulb of a thermometer and mercury in the thermometer shows a rapid increase. Name the radiation X
Answer the following questions based on a hot cathode ray tube
Name the charged particles
In a cathode ray tube, what is the function of anode?
State two similarities and two dissimilarities between the γ-rays and X-rays.
What happens to the atomic number of element when (i) An α -particle, (ii) A β -particle 1 and (iii) γ-radiation is emitted?
In the following fig. shows a radioactive source S in a thick lead container. The radiations pass through an electric field between the plates P and Q. Complete the diagram to show the paths of α , β and γ radiations.
Why is the source S placed in a thick lead container?
Name the three main parts of a Cathode Ray Tube.
Justify with reason, whether the following nuclear reactions are allowed or not.
\[\ce{^A_Z X -> ^A_{Z + 1}Y + ^0_{-1}β}\]
The activity of a certain radionuclide decreases to 15 percent of its original value in 10 days. What is its half life?
[ln (0.15) = -1.9]
Two radioactive materials A and B have decay constants 25λ and 16λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of B to that of A will be "e" after a time `1/("a"lambda)` The value of a ______.
