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Which of the following is not true for cathode rays?
- a)They start from the cathode and move towards the anode.
- b)They travel in a straight line in the absence of an external electrical or magnetic field.
- c)Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube.
- d)Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube.
Correct answer is option 'C'. Can you explain this answer?
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Which of the following is not true for cathode rays?a)They start from ...
Characteristics of cathode rays are:
(i) The cathode rays start from cathode and move towards the anode.
(ii) These rays themselves are not visible but their behaviour can be observed with the help of phosphor materials such as ZnS.
(iii) In the absence of electrical or magnetic field, these rays travel in straight lines.
(iv) In the presence of electrical or magnetic field, the behaviour of cathode rays are similar to that expected from negatively charged particles, suggesting that the cathode rays consist of negatively charged particles, called electrons.
(v) The characteristics of cathode rays (electrons) do not depend upon the material of electrodes and the nature of the gas present in the cathode ray tube.
Correct answer is C.
Correct answer is C.
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Which of the following is not true for cathode rays?a)They start from ...
Characteristics of Cathode Rays
- Origin: Cathode rays start from the cathode and move towards the anode in a vacuum tube.
- Path: They travel in a straight line in the absence of an external electrical or magnetic field, showing properties of a stream of particles.
- Dependence on Gas: The characteristics of cathode rays do not depend upon the nature of gas present in the cathode ray tube. Instead, they are primarily determined by the potential difference applied across the electrodes and the material of the electrodes.
- Dependence on Material: The characteristics of cathode rays do depend upon the material of electrodes in the cathode ray tube. The material affects the emission of electrons and the properties of the resulting cathode rays.
Therefore, the statement "Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube" is not true. The nature of the gas may affect other properties of the discharge in the tube, but it does not directly influence the characteristics of the cathode rays themselves.
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Which of the following is not true for cathode rays?a)They start from ...
C
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Which of the following is not true for cathode rays?a)They start from the cathode and move towards the anode.b)They travel in a straight line in the absence of an external electrical or magnetic field.c)Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube.d)Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube.Correct answer is option 'C'. Can you explain this answer?
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