The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least? A. 1120 ft B. 120 ft C. 56 ft D. 100 ft E. None of these Right Answer: 56 ft Share : February 19, 2018 Asghar Khan Everyday Science Total 1 Votes: 1 0 Tell us how can we improve this Mcqs? Captcha: + = Verify Human or Spambot ? Related Mcqs Check Below -Lead ball falls through water more slowly than through air because?The salinity of sea water is determined by the amount of common salt (Sodium Chloride) in __________ of sea water?Which one of the following is the main culprit in the thinning of Ozone layer in the earth’s stratosphere?