Question

Agun is fired in the air at a distance of 660 m from a person.
He hears the sound of the gun after 2 sec. What is the the
speed of sound?​

Answer 1

$\mathcal{\green{\underline{\blue{GIVEN:}}}}$

• Distance = 660m.
• Time = 2 seconds.

$\mathcal{\green{\underline{\blue{TO \:\: FIND:}}}}$

• We need to find the speed of sound.

$\mathcal{\green{\underline{\blue{SOLUTION:}}}}$

We know that formula of sound:

$\boxed{\sf{\blue{Speed \: \: of \:\: sound =\frac{Distance}{Time} }}}$

Thus, substitute.

$\sf Speed = \dfrac{660}{2}$

$\sf{\red{Speed = 330 ms^{-1}}}$

$\mathcal{\green{\underline{\blue{LEXICAL \:\: TERMS:}}}}$

• Sound is a vibration that propagates from one medium to another medium. The vibrations can be felt when they reach a person's or animal's ear (this is called hearing).
• The speed of sound in air varies with temperature and density of the medium.
• For example, the speed of sound in dry air at 20 °C =  343 m / s, whereas the speed of sound in 21° Celsius is 1480 m / s.
• An interesting fact is the speed of sound in a vacuum is 0 m / s because there are no particles for it to propagate. When communication systems are not working, astronauts join their helmets so that the sound travels from one helmet to another.