Figure show a simplified version of a device known as an lectron gun inside a cathode ray tube- X is a cathode which is heated by means of an electric current in the filament F- Y is a metallic hollow cylinder- F is connected to the terminals T 1 and T 2- X to the terminal T 3 and Y to the terminal T 4- What isthe utility of - F - and - X -T1T 3A- When current is passed through - F - it gets heated up and transmits the heat energy to - X - which is the anode and this anode accelerates the electronsB- When current is passed through - F - it gets heated up and transmits the heat energy to - X - which is the cathode and this cathode emits the thermions using this thermal energyC- When current is passed through - F - it emits electrons and - X - which is the cathode accelerates the electronsD- When current is passed through - F - it gets heated up and emits electrons- It then transmits the electrons to - X - which is the anode and this anode accelerates the electrons

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Derivation of formula for heat produced

Figure show a...

Question

Figure show a simplified version of a device known as an lectron gun inside a cathode ray tube, X is a cathode which is heated by means of an electric current in the filament F. Y is a metallic hollow cylinder. F is connected to the terminals T1 and T2, X to the terminal T3 and Y to the terminal T4. What is the utility of 'F' and 'X'?

When current is passed through ‘F’ it gets heated up and transmits the heat energy to ‘X’ which is the anode and this anode accelerates the electrons

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When current is passed through ‘F’ it gets heated up and transmits the heat energy to ‘X’ which is the cathode and this cathode emits the thermions using this thermal energy

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When current is passed through ‘F’ it emits electrons and ‘X’ which is the cathode accelerates the electrons

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When current is passed through ‘F’ it gets heated up and emits electrons. It then transmits the electrons to ‘X’ which is the anode and this anode accelerates the electrons

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Solution

The correct option is B
When current is passed through ‘F’ it gets heated up and transmits the heat energy to ‘X’ which is the cathode and this cathode emits the thermions using this thermal energy

When current is passed through ‘F’ it gets heated up and transmits the heat energy to ‘X’ which is the cathode and this cathode emits the thermions using this thermal energy. The filament ‘F’ is made up of Tungsten which gets heated very easily and the cathode is made up of a material with low thermionic work function and high melting point.

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