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Physics Lecture 25: Laser Radiation Quiz

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Questions and Answers

What does LASER stand for?

Light Amplification by Spontaneous Emission of Radiation
Light Amplification by Stimulated Emission of Rays
Light Amplification by Stimulated Emission of Radiation (correct)
Light Amplification by Spontaneous Emission of Rays

What is the term for the property of laser light that makes it have a single wavelength or color?

Monochromatic (correct)
Polarized
Coherent
Collimated

What is the term for the property of laser light that makes it travel in a straight line without diverging?

Polarized
Coherent
Monochromatic
Collimated (correct)

What is the term for the property of laser light that makes it have the same phase or alignment of the peaks and troughs of the waves?

Coherent (B) Signup and view all the answers

What is the advantage of laser light over ordinary light in terms of distance and energy?

Laser light can travel longer distances and concentrate more energy (C) Signup and view all the answers

What is the main function of a laser apparatus?

All of the above (D) Signup and view all the answers

What is the property of laser light that makes it have a very narrow spectrum or bandwidth?

Temporal coherence (A) Signup and view all the answers

What is the effect of spatial and temporal coherence on the quality of the laser beam?

Spatial coherence improves the collimation and focus of the laser beam, while temporal coherence improves the monochromaticity and bandwidth of the laser beam. (D) Signup and view all the answers

What is the process of spontaneous emission in a laser?

The emission of a photon by an excited atom without any external influence (B) Signup and view all the answers

What is the process of stimulated emission in a laser?

The emission of a photon by an excited atom due to the influence of another photon (C) Signup and view all the answers

What is the condition of population inversion in a laser?

The number of atoms in the ground state is less than the number of atoms in the excited state (B) Signup and view all the answers

What happens when electrons transition from an excited state to the ground state?

Photons are emitted (C) Signup and view all the answers

What does it mean when we say that the emitted photons are incoherent?

They are emitted randomly without a fixed phase relationship (B) Signup and view all the answers

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