12 Questions
What is the characteristic of laser light related to its wavelength?
Monochromatic, meaning it has a single wavelength.
How does the energy from a photon interact with matter?
It supplies energy, causing the system to transition to an excited state.
What happens when the system de-excites from a higher energy state to a lower energy state?
A photon with lesser energy is emitted due to the loss of energy through vibrational and/or rotational motion.
What is the ratio of the number of atoms in the E2 state to the number of atoms in the E1 state under thermal equilibrium?
N2/N1 = g2/g1e^(-(E2-E1)/kBT)
What is the condition for a system with only two energy levels?
The number of atoms in the excited state (N2) is always less than the number of atoms in the ground state (N1).
What is the unit of the Planck constant (h)?
eVHz^-1
What is the ratio of the number of atoms in the excited state to the number of atoms in the ground state at a temperature T, according to Boltzmann statistics?
e^(-ΔE/kBT)
In a 1 mole of H gas at 300K, how many Hydrogen atoms are in the excited state?
1
What is the condition required for stimulated emission to occur?
Population inversion and the presence of a photon of the same energy
What is the main difference between spontaneous and stimulated emission?
Spontaneous emission occurs without the presence of an external photon, while stimulated emission requires the presence of a photon of the same energy.
In which type of transitions is stimulated emission more likely to occur?
Lower energy transitions, such as microwave and magnetic resonance
What is the condition in which the number of atoms in the excited state is higher than in the ground state?
Population inversion
Test your knowledge on the characteristics of LASER light and how it differs from an ordinary light source. Explore concepts such as intensity, monochromaticity, collimation, and coherence in LASER technology.
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