ECEN 102 1-1 FINAL EXAM

the branch of Physics that is concerned with the production, control, transmission, reception and effects of sound.

• acoustics

• engineering

• sound system

• broadcasting

Sound is a ____________ energy that repetitively causes collisions of molecules in a medium, resulting in periodic changes in the form of waves.   

• mechanical

• electrical

• radio

• electromechanical

The common medium we use to propagate the sound signal is through  

• air

• coaxial cable

• water

• fiber optics

a pressure wave which travels in air at about 331 m/s at 0° C.

poin

• sound

• heat

• light

• snow

this determines the loudness of sound  

• amplitude

•  frequency

• phase

• time

The human hearing can only detect ____ of sound 

points

• decibel

• frequency

• phase

• loud sounds

The term bel is derived from the name of  ____

point

• Alexander Graham Bell

• Thomas Edison

• Benjamin Franklin

• Heinrich Hertz

 It is measured in watt per square meter  

points

• sound intensity

•  

  sound pressure

• sound electricity

• sound decibel

The threshold of hearing in dB at 1000 Hz _____ .  

points

• 25dB

• 15dB

• 0dB

•  100dB

Exposure to ___ can damage hearing.

points

• 100dB

•  0dB

• 25dB

• 15dB