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
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
举一反三
- Which of the following statements best describes a laser A: A device for stimulating atoms and molecules to emit light. B: An atom in a high-energy state. C: A technique for destroying atoms or molecules. D: An instrument for measuring light waves.
- 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.
- In hydrogen atom the angular momentum of the electron in the lowest energy state ( )
- Another example of a scientific model would be （）. A: a map B: a paper airplane C: an atom D: a light bulb
- Enzymes make use of nonprotein molecules: they frequently have a small molecule or metal atom associated with their active site that assists with their catalytic function.