An echo is a:
AA high-frequency sound only
BA type of light
CSound reflected from a distant surface and heard again
DSound created from nothing
Answer & Solution
Correct answer: C. Sound reflected from a distant surface and heard again
Echo = sound reflected from a distant hard surface, returning to the listener. To be heard as a SEPARATE sound, the echo must arrive at least 0.1 s after the original (this is why echoes need a minimum reflector distance of about 17 m in air).
Related questions
Which two animals are known to use natural echolocation to navigate and hunt?SONAR (SOund Navigation And Ranging) uses:Reverberation refers to:For a distinct echo to be heard, the reflecting surface must be at a minimum distance of (The audible range of frequency for humans is:The LOUDNESS of a sound depends on the wave's:Astronauts on the surface of the moon cannot hear each other's voice through air because:Sound is described as a LONGITUDINAL wave because: