0
the gas is ionized, and free electrons, accelerated by the electrical field in the tube, collide with gas and metal atoms. Some electrons circling around the gas and metal atoms are excited by these collisions, bringing them to a higher energy state. When the electron falls back to its original state, it emits a photon, resulting in visible light or ultraviolet radiation.
What else can I help you with?
What type of electrode is a cold cathode?
Cold cathode is a cathode, an electrode that emits electrons, which is not electrically heated by an element. Cold cathodes are used in gas discharge lamps such as neon lamps and discharge tubes.
How is Faraday's dark space created?
Faraday's dark space is created in a gas discharge tube when electrons gain enough energy to collide with gas atoms, causing them to emit light. The dark space is a region near the cathode where electrons lose energy due to collision with gas atoms, causing a decrease in electron density and subsequent decrease in light emission.
Why does electric discharge take place at low pressure and high potential?
Electric discharge occurs at low pressure and high potential because the low pressure reduces the number of gas molecules present, allowing for easier ionization and breakdown of the gas. The high potential creates a strong electric field, causing the free electrons to accelerate and gain energy before colliding with gas molecules, leading to ionization and discharge.
What gas is given off by a charging battery?
Generally, automotive batteries discharge Hydrogen Gas during both the charging and discharge cycles.
What does the gas discharge bulb contain?
Mercury.
Who discovered gas discharge tube?
Johann Wilhelm Hittorf, a German physicist, is credited with discovering the gas discharge tube in the mid-19th century. His experiments with cathode rays in partially evacuated tubes laid the foundation for the development of early gas discharge tubes.
What is a noble gas but does not have 8 valence electrons?
Helium is the only noble gas that doesn't have 8 valence electrons. It only has 2.
What element is a noble gas and has 36 electrons?
Krypton is a noble gas with 36 electrons.
Why glow appears in discharge tube?
Glow appears in a discharge tube due to electrons colliding with gas atoms, exciting them to higher energy levels. When the excited atoms return to their ground state, they release photons of light, creating the glow.
When gas is heated it emits light. explain why this phenomenon occurs?
When gas is heated, the energy causes the electrons in the gas atoms to become excited and jump to higher energy levels. As these electrons return to their original, lower energy states, they release the excess energy in the form of light. This emission occurs at specific wavelengths, resulting in the characteristic colors associated with different gases. This phenomenon is the basis for applications like neon signs and gas discharge lamps.
How do you get low pressure gas discharge?
Low pressure gas discharge is typically achieved by enclosing gas in a container at low pressure and then applying a high voltage across the electrodes inside the container. This high voltage causes the gas to become ionized, creating a glowing discharge. Examples include fluorescent lights and neon signs.
Is nitrogen neutral gas?
Nitrogen gas does not gain or remove electrons. Therefor this gas is neutral.
