For an echo to be distinguished as separate, it should reach the ear _________ of a second after the direct sound.(a) One-fourth(b) One-fifth(c) One-eighth(d) One-tenthI got this question in an interview for job.Query is from Acoustics in section Acoustics and Ventilation of Construction & Building Materials

For an echo to be distinguished as separate, it should reach the ear _

1.	For an echo to be distinguished as separate, it should reach the ear _________ of a second after the direct sound.(a) One-fourth(b) One-fifth(c) One-eighth(d) One-tenthI got this question in an interview for job.Query is from Acoustics in section Acoustics and Ventilation of Construction & Building Materials
Answer» RIGHT answer is (d) One-tenth Best explanation: An ECHO is a defect that is CAUSED due to the reflection of sound waves. For an echo to be distinguished as SEPARATE, it should REACH the ear one-tenth of a second after the direct sound.

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