Answer
Verified
91.2k+ views
Hint When the gas in the tube is heated the electron gets excited and when it returns back to its ground state it loses energy which falls in the visible light region causing the fluorescence observed. It is the gas that glows and provides the light in the tube. Energy absorption happens in the form of electricity and remission in the form of light.
Complete step by step solution The florescence of the glass discharge tube is due to conversion of electric energy to light energy. When the gas used in the glass discharge tube, which is generally a halogen (except Br) is ionized or heated, its electrons absorb the energy to reach a higher energy state. When these electrons emit energy to reach a stable ground state, they release energy in the form of light of their respective wavelength. This is the reason for the illumination of the glass discharge tube at low pressure.
Therefore, the correct answer is option B.
Note: A discharge tube is a glass tube which has two electrodes. They are sealed and when a voltage is applied the pressure of the gas is reduced and a pressure is reached at which the current flows and the gas begins to glow. The illumination produced by the phosphorus present in the surface is called phosphorescent. Generally, only inert gasses are used in the tube because of their stable behavior.
Complete step by step solution The florescence of the glass discharge tube is due to conversion of electric energy to light energy. When the gas used in the glass discharge tube, which is generally a halogen (except Br) is ionized or heated, its electrons absorb the energy to reach a higher energy state. When these electrons emit energy to reach a stable ground state, they release energy in the form of light of their respective wavelength. This is the reason for the illumination of the glass discharge tube at low pressure.
Therefore, the correct answer is option B.
Note: A discharge tube is a glass tube which has two electrodes. They are sealed and when a voltage is applied the pressure of the gas is reduced and a pressure is reached at which the current flows and the gas begins to glow. The illumination produced by the phosphorus present in the surface is called phosphorescent. Generally, only inert gasses are used in the tube because of their stable behavior.
Recently Updated Pages
Name the scale on which the destructive energy of an class 11 physics JEE_Main
Write an article on the need and importance of sports class 10 english JEE_Main
Choose the exact meaning of the given idiomphrase The class 9 english JEE_Main
Choose the one which best expresses the meaning of class 9 english JEE_Main
What does a hydrometer consist of A A cylindrical stem class 9 physics JEE_Main
A motorcyclist of mass m is to negotiate a curve of class 9 physics JEE_Main
Other Pages
The vapour pressure of pure A is 10 torr and at the class 12 chemistry JEE_Main
Electric field due to uniformly charged sphere class 12 physics JEE_Main
3 mole of gas X and 2 moles of gas Y enters from the class 11 physics JEE_Main
If a wire of resistance R is stretched to double of class 12 physics JEE_Main
Derive an expression for maximum speed of a car on class 11 physics JEE_Main
Velocity of car at t 0 is u moves with a constant acceleration class 11 physics JEE_Main