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Select the right word given in the table:
  
depth of the sea
ultrasonic sound
  cochlea
 amplitude
auditory
crowded together
Frequency
 infrasonic
energy
Shriller
longitudinal    Bell-jar experiment
  
1. Compressions are the regions where particles are .
 
2. is the number of vibrations made by a vibrating body in one second.
 
3. Sound is a wave and needs a material medium to travel.