Reverberation is the persistence of sound in a space after the original sound source has stopped, often perceived as an unwanted echo. It occurs due to sound waves reflecting off surfaces.
The way sound interacts with surfaces determines the level of reverberation. Different materials affect sound reflection and absorption differently:
Therefore, using sound-absorbent materials is the correct method to reduce reverberations.
What special name is given to the frictional force exerted by a fluid?
______ is used in periscope.
Zero degree centigrade is equal to what degree Fahrenheit?
A. 100°F
B. 30°F
C. 34°F
D. 32°F
Keeping voltage constant, if more lamps are put into a series circuit, the overall current in the circuit:
A. Increases
B. Decreases
C. Remains the same
D. Becomes infinite
Excessive curvature of eye lens leads to _______