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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

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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. 

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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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पाठ 14: Substances in Common Use - Exercise [पृष्ठ १६२]

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बालभारती Science and Technology [English] Standard 9 Maharashtra State
पाठ 14 Substances in Common Use
Exercise | Q 4. f. | पृष्ठ १६२

संबंधित प्रश्‍न

Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.


Answer the following questions based on a hot cathode ray tube.

State the approximate voltage used to heat the filament


Answer the following questions based on a hot cathode ray tube.

What will happen to the beam when it passes through the electric field?


In a cathode ray tube, what is the function of anode?


Under which conditions does the nucleus of an atom tend to radioactive?


Name the unit in which the work function of a metal is expressed.


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.


When is said to be the nucleus unstable?


Give the relative ionizing power of α, β and γ radiations.


What are the names of the three types of rays given off by a radioactive substance? Define the properties you know they possess. Why are the largest atoms radioactive?

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(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?


Why should a radioactive substance not be touched by hands?


How is a cathode ray tube used to convert an electrical signal into a visual signal?


What is meant by Radioactivity?


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 ______.


Calculate the time interval between 33% decay and 67% decay if half-life of a substance is 20 minutes.


Assertion (A): Hydrogen atom consists of only one electron but its emission spectrum has may lines.

Reason (R): Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.


Assertion (A): The force of repulsion between atomic nucleus and α-particle varies with distance according to inverse square law.

Reason (R): Rutherford did α-particles scattering experiment.


Which statement about gamma decay is correct?


In the discovery of radioactivity, why could the darkening of the covered photographic plate NOT be explained by ordinary visible light?


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