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Match it!
Match it! Select the correct answer from the pull down...Good luck!
Ultra sounds have frequencies :
Lie between 20HZ and 2000Hz
Sound emittors
Mechanical wave
Above 20000 Hz
Vacum
1000 m
All choices
Reflection
Echo is a bounce of sound on an obstacle by :
Lie between 20HZ and 2000Hz
Sound emittors
Mechanical wave
Above 20000 Hz
Vacum
1000 m
All choices
Reflection
The time separating production of sound and receiving its echo is t=2 sec ( Velocity of sound in air is 340m/sec then the distance is :
Lie between 20HZ and 2000Hz
Sound emittors
Mechanical wave
Above 20000 Hz
Vacum
1000 m
All choices
Reflection
Sound propagates in:
Lie between 20HZ and 2000Hz
Sound emittors
Mechanical wave
Above 20000 Hz
Vacum
1000 m
All choices
Reflection
Sound wave is :
Lie between 20HZ and 2000Hz
Sound emittors
Mechanical wave
Above 20000 Hz
Vacum
1000 m
All choices
Reflection
Speakers:
Lie between 20HZ and 2000Hz
Sound emittors
Mechanical wave
Above 20000 Hz
Vacum
1000 m
All choices
Reflection
Sound wave cannot propagate in
Lie between 20HZ and 2000Hz
Sound emittors
Mechanical wave
Above 20000 Hz
Vacum
1000 m
All choices
Reflection
The audible sound has frequencies:
Lie between 20HZ and 2000Hz
Sound emittors
Mechanical wave
Above 20000 Hz
Vacum
1000 m
All choices
Reflection
Check it!