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प्रश्न
Give a scientific explanation.
When the radiation coming out from a certain radioactive substance is passed through an electric field, marks are found at three places on the photographic plate placed in its path.
उत्तर
When the radiation coming out from a certain radioactive substance is passed through an electric field, marks are found at three places on the photographic plate placed in its path. These three marks represent the three kinds of rays which are emitted by the radioactive substances. One type of radiation deviated slightly towards the negatively charged plate and was called alpha rays. The second type of radiation deviated substantially towards the positively charged plate and was called the beta rays. The third type of radiation did not deviate at all and was called the gamma rays.
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संबंधित प्रश्न
Answer the following questions based on a hot cathode ray tube
Name the charged particles
Represent the change in the nucleus of a radioactive element when a β particle is emitted.
Why is a cathode ray tube evacuated to a low pressure?
Radiations given out from a source when subjected to an electric field in a direction perpendicular to their path are shown below in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions in terms of A, B and C.
1) Name the radiation B which is unaffected by the electrostatic field.
2) Why does the radiation C deflect more than A?
3) Which among the three causes the least biological damage externally.
4) Name the radiation which is used in carbon dating.
What do you mean by Mass number.
State two similarities and two dissimilarities between the γ-rays and X-rays.
What happens to the mass number of an element when (i) an α -particle, (ii) a β -particle, and (iii) γ -radiation is emitted?
A radioactive nuclide `""_86^226` Ra decays by emission of two alpha particles, one beta particle and gamma rays. Which of the following is the resulting nuclide X?
Radioactive substances were found to give off three types of rays. Name them. How do they
(a) React to the magnetic field?
(b) React to the electric field?
(c) Act when different thickness of lead sheets is placed in their path?
A radioactive substance is oxidized. What changes would you expect to take place in the nature of radioactivity? Explain your answer.
A nucleus is \[\ce{^24_11 Na}\] β-radioactive.
Write the equation represent β-decay.
An element P disintegrates by α - -emission and the new element suffers two further disintegrations, both by β -emission, to form an element Q. Explain the fact that P and Q are the isotopes.
State three safety precautions that you would take while handling the radioactive substances.
Define bound electrons.
Define mass number of an element.
State two characteristics of the substance used as thermionic emitter.
State one use of radio-isotopes.
Mention four properties of Becquerel rays.
