A sound wave has a
frequency of 2 kHz and wave length
35 cm. How long will it take to travel
1.5 km?
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Answer:
It will take 2.14 second to travel 1.5 km.
Explanation:
Given,
Frequency = f = 2kHz = 2000 Hz
Wavelength = λ = 35 cm = 35 / 100 m
To find: How long will it take to travel 1.5 km
Solution:
Concept: Wave speed is defined as the product of wavelength and frequency.
i.e v = λf
here, λ = 35/100 m and f = 2000 Hz
Substituting the values,
v = 35/100* 2000 = 700 m /s
So, Speed of sound wave is 700 m/s
Then, Time taken to travel the distance of 1.5 km = 1500 m will be:
Time taken = distance travelled / wave velocity
or, t = 1500 / 700 = 2.14 seconds
Therefore, it will take 2.14 second to travel 1.5 km.
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