AlexisLee
contestada

Jamal blasts an air-horn to start a race. Lewis hears the horn from his house 274 meters away. Given that sound travels through air at 340 m/s, how long did it take the sound to travel from Jamal to Lewis?

440 s
0.81 s
1.2 s
66 s

Respuesta :

AL2006


                   (274 meters)  x  (1 sec / 340 meters)

               =    (274 / 340)  sec

               =       0.806 second   (rounded) 

Answer : Time taken by sound to travel from Jamal to Lewis is 0.81 s.

Explanation :

Given that,

Lewis hears the horn from his house 274 meters away.

The speed of the sound is [tex]v_s=340\ m/s[/tex]

We have to find the time taken by the sound to travel from Jamal to Lewis. For this we will use the definition of speed which is given by :

[tex]v_s=\dfrac{d}{t}[/tex]

or

[tex]t=\dfrac{d}{v_s}[/tex]

[tex]t=\dfrac{274\ m}{340\ m/s}[/tex]

[tex]t=0.805\ s[/tex]

or

[tex]t=0.81\ s[/tex]

So, the correct option is (b).

Hence, this is the required solution.

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