Question

multiple choice question
an echo is a reflected sound that can be ________.
o reflected at least one more time
o only made in a cave
o distinguished from the original sound
o heard because it changed into a transverse wave
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Explanation:

An echo is a reflected sound. For it to be an echo, it must be distinguishable from the original sound. If it couldn't be distinguished, it would just be part of the original sound's reverberation.

• "Reflected at least one more time" is not the key characteristic of an echo.
• "Only made in a cave" is incorrect as echoes can occur in many places (e.g., large empty rooms).
• Sound is a longitudinal wave, and it doesn't change to a transverse wave to be heard as an echo.

Answer:

distinguished from the original sound