Collisional Broadening in Spectra

What happens to the emission spectra of low-pressure gases as pressure and temperature increase?

• It becomes more discrete

• It changes to a more continuous one

• It remains unchanged

• It becomes invisible.

Collisional broadening occurs due to the perturbation by colliding atoms in a high-pressure gas, resulting in the broadening of ________ lines.

• A) emission and absorption

• B) only emission

• C) only absorption

• D) neither emission nor absorption

What is the photoelectric effect?

• Emission of electrons when electromagnetic radiation hits a material

• Absorption of light by electrons

• Reflection of light waves

• Transmission of light through a medium.

The photoelectric effect demonstrates that light should be treated as a swarm of discrete packets known as ______.

• Waves

• Particles

• Photons

• Electrons

Thomson scattering is the (a)   of electromagnetic radiation by a free-charged particle.

• Elastic scattering
• Inelastic scattering
• Scattering of high-frequency photon
• Interaction with a stationary charg

In Compton scattering, the wavelength of the scattered light is _______ from that of the incident radiation.

• the same

• different

• higher

• lower

Match the following scenarios with what happens to a photon during Inverse Compton Scattering.

• A photon passes through a medium without interacting.

• It loses energy

• A photon undergoes a process resulting in two lower-energy photons.

• It gains kinetic energy

• A photon interacts with a particle and transfers some of its energy to the particle.

• It splits into two photons.

• A photon collides with a high-energy electron and gains energy.

• It remains unchanged

In Double and Multiple Compton Scattering, a seed photon is scattered on one electron and results in (a)   .

• one outgoing photon
• two or more outgoing photons
• no outgoing photons
• a single electron.

What causes the blue color of the daytime sky?

• Mie scattering

• Rayleigh scattering

• Doppler Shift

• Raman scattering

Mie scattering is an elastic scattering of light by a dielectric sphere. It is much stronger than (a)   scattering.

• Rayleigh
• Doppler
• Raman
• None of the above