Lasers are used to create holograms because
A. they are cool
B. they exhibit high coherence
C. they are red
D. they have lots of energy
B. they exhibit high coherence
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A telescope whose objective is a lens and contains no mirrors is a(n) ____ telescope
a. Refracting b. Reflecting c. Deflecting d. Compound e. Retracting
Consider a vibrating string that makes a sound wave that moves through the air. As the guitar string moves up and down, the air molecules that are a certain horizontal distance from the string will move
a. up and down. b. toward and away from the guitar string. c. back and forth along the direction of the length of the string. d. in circles around the guitar string.
When an earthquake occurs, the point of initial energy release is called the earthquake's ______________
a. epicenter b. fault line c. focus d. none of the above
In what way is laminar flow different than turbulent flow?
What will be an ideal response?