Laser Quiz

When a beam of light enters one medium from another, which quantity will not change?

• Direction

• Speed

• Frequency

• Wavelength

Dispersion is used to describe the

• Splitting of white light into its component colors

• Propagation of light in straight lines

• Bending of a beam of light when it goes from one medium to another

• Bending of a beam light when it strikes a mirror

The wavelength of light has no role in

• Diffraction

• Interference

• Polarization

• Reflection

Laser light is ______ emission.

• Coherent

• Stimulated

• Spontaneous

• Coherent and stimulated

Which of the following factor does not harm laser efficiency?

• Atmospheric absorption

• Excitation energy not absorbed

• Problems in depopulating the lower laser level

• Inefficiency in populating the upper laser level

Which one of the following statements is true for the speed v and the acceleration of a particle executing simple harmonic motion?

• When c is maximum, a is maximum

• Value of a is zero, whatever may be the value of v

• hen v is zero, a is zero

• When v is maximum, a is zero

The circular motion of a particle whose speed is constant is ______________

• Periodic but not simple harmonic

• Simple harmonic but not periodic

• Periodic and simple harmonic

• Neither periodic not simple harmonic

A particle of mass m is hanging vertically by an ideal spring of force constant K. if the mass is made to oscillate vertically, its total energy is

• Maximum at extreme position

• Maximum at mean position

• Minimum at mean position

• Same at all positions

The main benefit of light-wave communications over microwaves or any other communications media is

• Lower cost

• Better security

• Wider bandwidth

• Freedom from interference

Coherence of laser light is important for _________

• Light propagation

• Getting laser light to pass through air

• Drilling holes

• Holography