Question

A sound wave has a frequency of 2 kHz and wave length 35 cm. How long
will it take to travel 1.5 km?​

Answer 1

Explanation:

please follow me

ANSWER

Speed of sound wave v=νλ=2000×0.35=700 m/s

Distance d=1.5 km=1500 m

Time t=

v

d

=

700

1500

≈2 s

Answer 2

$\bold{\huge{\underline{\underline{\rm\red{Question : }}}}}$

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

$\bold{\huge{\underline{\underline{\rm\red{ANSWER: }}}}}$

Given

Distance= 1.5 km

wavelength= 35 cm

frequency= 2 KHz

To find

time taken by sound waves

Formula used

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

$\bold{\huge{\underline{\underline{\rm\red{SOLUTION : }}}}}$

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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$\bold{\huge{\underline{\underline{\rm\red{Thanks}}}}}$