· A sound wave has frequency of 2 kHz and wavelength of 35 cm. If an observer is1.4 km away from the source. At whattime interval could the observer hear thesound?(a) 2s (b) 20 (c) 0.55 (d) 45

· A sound wave has frequency of 2 kHz and wavelength of 35 cm. If a

1.	· A sound wave has frequency of 2 kHz and wavelength of 35 cm. If an observer is1.4 km away from the source. At whattime interval could the observer hear thesound?(a) 2s (b) 20 (c) 0.55 (d) 45
Answer» It will TAKE 2 second to travel 1.5 km.Explanation:Given,Frequency = f = 2kHz = 2000 HzWavelength = λ = 35 cm = 35 / 100 MTO find: How long will it take to travel 1.5 kmSolution:Concept: WAVE SPEED is defined as the product of wavelength and frequency.i.e v = λfhere, λ = 35/100 m and f = 2000 HzSubstituting the values,v = 35/100* 2000 = 700 m /sSo, Speed of SOUND wave is 700 m/sThen, Time taken to travel the distance of 1.4 km = 1400 m will be:Time taken = distance travelled / wave velocityor, t = 1400 / 700 = 2 secondsTherefore, it will take 2 second to travel 1.5 km.

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· A sound wave has frequency of 2 kHz and wavelength of 35 cm. If an observer is1.4 km away from the source. At whattime interval could the observer hear thesound?(a) 2s (b) 20 (c) 0.55 (d) 45​

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· A sound wave has frequency of 2 kHz and wavelength of 35 cm. If an observer is1.4 km away from the source. At whattime interval could the observer hear thesound?(a) 2s (b) 20 (c) 0.55 (d) 45