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In the phenomenon of electric discharge ...

In the phenomenon of electric discharge through gases at low pressure , the coloured glow in the tube appears as a result of

A

excitation of electrons in the atoms

B

collision between the atoms of the gas

C

collissions between the charged particles emitted from the cathode and the atoms of the gas

D

collission between diferent electrons of the atoms of the gas

Text Solution

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The correct Answer is:
To solve the question regarding the colored glow in a tube during electric discharge through gases at low pressure, we can break it down into the following steps: ### Step 1: Understanding Electric Discharge Electric discharge through gases occurs when a high voltage is applied across two electrodes (cathode and anode) in a gas-filled tube. This causes electrons to be emitted from the cathode. **Hint:** Consider what happens when a voltage is applied to a gas-filled tube. ### Step 2: Role of Charged Particles The emitted electrons (charged particles) from the cathode collide with the gas atoms present in the tube. These collisions can transfer energy to the gas atoms. **Hint:** Think about what happens during collisions between electrons and gas atoms. ### Step 3: Excitation of Electrons When the electrons collide with the gas atoms, they can excite the electrons in the gas atoms to higher energy levels. This is known as excitation. **Hint:** Recall what happens to an electron in an atom when it absorbs energy. ### Step 4: Return to Ground State After excitation, the electrons in the gas atoms eventually return to their ground state. As they do so, they release energy in the form of light. **Hint:** What happens to an excited electron when it loses energy? ### Step 5: Emission of Visible Light The energy released during this transition corresponds to specific wavelengths of light, which can be visible to the human eye. This is why we see a colored glow in the tube. **Hint:** Consider the relationship between energy levels in atoms and the colors of light emitted. ### Conclusion The colored glow in the tube during electric discharge through gases at low pressure is a result of the excitation of electrons in the atoms of the gas. When these excited electrons return to their ground state, they emit light of specific wavelengths, leading to the observed colors. **Final Answer:** The colored glow in the tube appears as a result of the excitation of electrons in the atoms.
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