Laser-1

Full form of LASER

• Light Amplification by Spontaneous Emission of Radiation

• Light Amplification by Stimulated Emission of Radiation

• Light Attenuation by Stimulated Emission of radiation

• None of these

Which is not a characteristic of Laser?

• Chromatic

• High intensity

• Unidirectional

• Monochromatic

Interaction of atom with light photon is one of the mean of supplying energy to electrons to undergo transition

• True

• False

The atoms _______________ energy to reach from lower energy level to upper energy level.

• absorbs

• release

• produce

• none of above

The emission of light on its own is called___________ emission.

• Stimulated

• Spontaneous

• Triggered

• None of these

The process of Stimulated emission causes __________ photons.

• single

• multiple

• no radiation

• none of these

The name of process which is responsible for Laser action is ____________.

• Spontaneous emission

• Stimulated emission

• Attenuation

• Absorption

The figure represents, which of the following import property of Laser.

• Coherence

• Chromatic

• Divergence

• Ray

Population inversion in Laser is achieved ________

• when more atoms exist in lower energy state as compared to higher energy state

• when more atoms exist in higher energy state as compared to lower energy state

• none of these

The life time of electron in meta stable state is ________

• 10^-9 seconds

• 10^-8 seconds

• 10^-3 seconds

• 10^-7 seconds