Which is NOT the correct description about Laser?
A: It stands for Light Amplification by Stimulated Emission.
B: It’s a beam of light energy.
C: All the light waves in a laser are emitted in the same rhythm.
D: The light waves in a laser are of different wavelengths.
A: It stands for Light Amplification by Stimulated Emission.
B: It’s a beam of light energy.
C: All the light waves in a laser are emitted in the same rhythm.
D: The light waves in a laser are of different wavelengths.
举一反三
- A laser can be best described by______. A: a device for stimulating atoms and molecules to emit light B: an atom in a high energy state C: a technique for destroying atom or molecules D: an instrument for measuring light waves
- Codes are scanned by ______. A: the checkout clerk B: the customers themselves C: a laser beam of light D: the cash register
- The<br/>three basic processes involved in generating laser include:() A: spontaneous<br/>radiation B: stimulated<br/>emission C: stimulated<br/>absorption D: laser<br/>amplification
- In his research at Columbia University, Charles Townes worked with all of the following EXCEPT _________. A: stimulated emission B: microwaves C: light amplification D: a maser
- The light emitted by the LED is incoherent light, and its basic principle is . A: spontaneous radiation B: stimulated absorption C: stimulated radiation D: spontaneous absorption