The acronym LASER stands for...

• light amplification by standart emission of ray

• light amplification by semiconductor emission radiant

• light amplification by stimulated emission of radiation

• low amplification by stimulated emission radiation

Laser is a coherent source of light. This means all the light waves....

• are out of phase

• are in phase

• have different directions

• have same direction

Laser is a monochromatic source of light. This means all the light waves have...

• same wavelength

• same phase

• same intensity

• same direction

In spontaneous emission the incident and emitted waves are...

• similar

• different

• amplified

• coherent

Albert Einstein discovered the most important process of the laser. What is it?

• Einstein Process

• photon emission

• medium process

• stimulated emission

Pump system needs to raise the atoms from...

• exited state to ground state

• ground state to exited state

• ground state to unexcited state

• excited state to exited state

Red-light laser contain a long crystal made of ...

• agate

• tourmaline

• coral

• ruby

The resonator consists of ... mirrors at least.

• 2

• 3

• 4

• 5

The medium in which atoms are excited called...

• amplifying

• gain

• increasing

• magnifying

The first laser was built in...

• 1920

• 1940

• 1960

• 1980