What time interval could the observer hear the sound?

A sound wave has frequency of 2 kHz and wavelength of 35 cm. If an observer is l.4 km away from the source,  after  what  time interval could the observer hear the sound?

  1. 2 s
  2. 20 s
  3. 0.5 s
  4. 4 s
Anurag Mishra Professor Asked on 27th February 2016 in Physics.
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