Question

How long a sound wave takes to travel 1.5 km if its frequency is 2 kHz and wave lenght is 35 cm ?​

Answer 1

QUESTION:

How long a sound wave takes to travel 1.5 km if its frequency is 2 kHz and wave lenght is 35 cm ?

ANSWER:

2.1s

STEP BY STEP EXPLANATION:

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

Asking:

How long will it take to travel 1.5 km?

Thus sound will take 2.1 s to travel a distance of 1.5 km.

Answer 2

Answer:

Question

How long a sound wave takes to travel 1.5 km if its frequency is 2 kHz and wave lenght is 35 cm

Given

Distance= 1.5 km

wavelength= 35 cm

frequency= 2 KHz

To find

time taken by sound waves

Formula used

$\bold{: \to\: speed =wavelenght \times frequency} \\ \\\bold{: \to \: time = \frac{distance}{speed} }$

Solution

frequency= 2KHz = 2 x 1000= 2000 hz

wavelength= 35 cm = 0.35 m

❐speed =wavelenght x frequency

➥speed = 0.35 x 2000

➥speed = 700 m/sec

❐time= distance/speed

➥time = 1.5 x 1000/ 700

➥time = 2.1 seconds

Thus sound will take 2.1 second to travel distance of 1.5 km

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