Assertion: echo | /r/HasProperty | heard
Facets:
value: distinctly
type: MANNER
value: by shouting near a deep ditch
type: LOCATION
value: clearly
type: MANNER
Source sentences:
text: When the sound is reflected repeatedly from a number of obstacles, more than one echoes, called multiple echoes are heard.
text: Since the sensation of sound persists for 1/10 second after it is produced, the echo can be heard distinctly only if it reaches at least 1/10 second after the original sound is produced.
text: For an echo to be heard distinctly,
text: Thus, the minimum distance (in air at 25ºC) between the observer and the obstacle for the echo to be heard clearly should be 17.2 m.
text: An echo can also be heard by shouting near a deep ditch or a well.