Q5 of 22 Page 113

(i) Sketch and label the parts A,B,C,D and E in the figure given below:


(ii) What is the purpose of B?


(iii) What is the function of D?

(i) A= Cathode

B= Pump


C= Anode


D=Bright spot


E=Cathode rays


(ii) B= pump. It is used to lower the pressure of the gas inside the discharge tube.


(iii)D= Bright spot. The presence of bright spot confirms the working of cathode rays.


More from this chapter

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5

Gomathi filled a discharge tube with a particular gas and connected it as shown in the figure.


She applied high voltage but the bulb did not glow. What should Gomathi do to make the bulb glow?

 5

Observe the size and direction of your shadow, when you stand in the sunlight in the morning and in the evening.


(i) Is the length of your shadow the same as your height?


(ii) What is the direction of the shadow? Does it fall in the direction of the source of light or in the direction opposite to the light source?


(iii) Compare the nature of the shadow formed in this activity with that of the shadow formed when an object is kept in the path of the cathode rays.

 5

Cathode and Anode rays are negatively and positively charged particles respectively. They travel in a direction opposite to each other. Why don't they get neutralized?

 5

Why did Thomson assume that electrons are embedded in a positively charged sphere? Why did he not assume that they are positively charged particles embedded in a negatively charged sphere?