A sound wave has frequency of 2 kHz and wavelength of 35 cm. If an observer is 1.4 km away from the source, after what time interval could the observer hear the sound?

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Q: 13 (NDA-I/2014)
A sound wave has frequency of 2 kHz and wavelength of 35 cm. If an observer is
1.4 km away from the source, after what time interval could the observer hear the sound?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,7,7,7,4,2,1

keywords: 

{'time interval': [0, 0, 0, 1], 'sound wave': [0, 0, 0, 5], 'frequency': [0, 0, 1, 3], 'khz': [0, 0, 1, 2], 'wavelength': [0, 0, 3, 3], 'sound': [4, 3, 10, 15], 'observer': [0, 1, 2, 3], 'km': [0, 0, 2, 1]}