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Question

The fluorescent tubes and neon sign bulbs glow because:


A

Presence of charged particles

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B

High density of gases

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C

High temperature

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D

High applied voltage

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Solution

The correct option is A

Presence of charged particles


Correct Answer: Option (A) Presence of charged particles.

The explanation for the correct answer:

  1. Both fluorescent tubes and neon bulbs produce light by converting electrical energy.
  2. The fluorescent tube and neon sign bulbs consist of plasma.
  3. There is neon gas inside a neon sign bulb, and helium gas or some other gas inside a fluorescent tube.
  4. When electrical energy flows through a gas, it is ionized or charged.
  5. Therefore, fluorescent tubes and neon sign bulbs glow due to the presence of charged particles.

The explanation for the incorrect answer:

Option(B)-High density of gases:

  1. Density of gases: It is defined as the mass of the gas occupying a certain volume at specified pressure and temperature.
  2. The fluorescent tubes and neon sign bulbs glow because of charged particles but not by a high density of gases.

Option(C)- High temperature:

If there is a high temperature then it could be heating up to the bulbs due to which breakage of glass takes place. due to which the fluorescent tubes and neon sign bulbs don't glow at high temperatures.

Option(D)-High applied Voltage:

Fluorescent tubes and neon sign bulbs are ignited by high applied voltage but the presence of the charged particles makes the fluorescent tubes and neon sign bulbs glow.

The fluorescent tubes and neon sign bulbs glow because of Option (A) Presence of charged particles.


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