Question

Fig. 7.1 shows a simple version of an electron-beam tube.​

Answer 1

Answer:

electrons leave the electrode to complete the circuit

2)electrons accelerate because they are moving under a constant force i.e constant acc.

3)we need vacuum so that we can clearly see cathode rays travelling if there is no vaccum the rays would collide with the gas particle present there

Explanation:

Answer 2

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1. Bez of the gap b/w the cathode and anode and electrons move from cathode to anode due to P. D so they take air as medium to travel
2. As they r attracted towards the anode so they got the force for acceleration
3. Bez otherwise electrons might be defected due to charged gas or dust particles, which can change all observations.

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