Plasma State
Chemistry ⇒ States of Matter
Plasma State starts at 10 and continues till grade 12.
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See sample questions for grade 12
Calculate the number of electrons in 1 cm³ of plasma if the electron density is 1.0 × 10¹⁸ electrons/cm³.
Describe how plasma is used in plasma cutting technology.
Describe one industrial use of plasma technology.
Describe the difference between a fully ionized plasma and a partially ionized plasma.
Describe the process by which a neutral gas is converted into plasma.
Describe the role of plasma in the process of nuclear fusion in stars.
Explain the role of plasma in fluorescent lamps.
Explain the significance of the Debye length in plasma physics.
Explain why plasma is considered different from a gas, even though both do not have a definite shape or volume.
Explain why plasma is often called a 'quasi-neutral' medium.
Explain why plasma is often called an 'ionized gas'.
Explain why plasma is used in waste treatment technologies.
Name two common applications of plasma in everyday technology.
State one difference between thermal plasma and non-thermal plasma.
A certain plasma has an electron density of 2.5 × 1019 m−3. Calculate the plasma frequency (in Hz) for this plasma. (Use the formula: ωp = √(nee2 / (ε0me)), where ne is the electron density, e is the elementary charge, ε0 is the vacuum permittivity, and me is the electron mass. Give your answer to two significant figures.)
A laboratory plasma has a temperature of 2 × 104 K and an electron density of 1 × 1017 m−3. Calculate the Debye length (λD) for this plasma. (Use the formula: λD = √(ε0kBTe / (nee2)), where kB is Boltzmann's constant, Te is electron temperature, ne is electron density, e is elementary charge, and ε0 is vacuum permittivity. Give your answer in meters to two significant figures.)
Describe the process of plasma recombination and discuss its significance in both astrophysical and laboratory plasmas.
Explain the concept of plasma frequency and its significance in the propagation of electromagnetic waves through a plasma.
Explain why the concept of 'quasi-neutrality' is important in plasma physics, and describe a situation where this assumption may break down.
