Question

A boy fires a gun an another boy at a distance of 1020 m hears the sound of firing the gun 3 sec after seeing its smoke.Find the speed of sound.

Answer 1

Answer:

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Explanation:

ANSWER

The speed of the sound, distance travelled and the time taken relationship is given as follows.

Speedofsound=

Timetaken

Distancetravelled

From this equation the Distance traveled is derived as

Distancetravelled=Speedofsound×Timetaken

That is, Distancetraveled=340m/s×2.5seconds

=850meters.

Hence distance between boys is 850 m

Answer 2

$\huge {\mathfrak {\underline {\underline {Questíon}}}} :-$

➝ A boy fires a gun an another boy at a distance of 1020 m hears the sound of firing the gun 3 sec after seeing its smoke.Find the speed of sound.

$\huge {\mathfrak {\underline {\underline {gíven}}}} :-$

➝ Distance, d = 1020m

➝ time, t = 3sec

$\huge {\mathfrak {\underline {\underline {to \: fínd}}}} :-$

➝ The speed of sound

$\huge {\mathfrak {\underline {\underline {solutíon}}}} :-$

$\longmapsto \tt sound = \frac{distance}{time}$

$\longmapsto \tt sound = \cancel \frac{1020}{3}$

$\longmapsto \boxed{ \tt sound = 340 {ms}^{ - 1} }$

Thus, the speed of sound is 340m/s

_________________

Additional information....

➤ What is sound ?

• Sound is a pressure wave which is created by a vibrating object. This vibrations set particles in the sur- rounding medium (typical air) in vibrational motion, thus transporting energy through the medium.

➤ Characteristic of sound :-

➝ Loudness :-

• The loudness of sound depends on its amplitude. The loudness of sound is proportional to the square of the amplitude. A roar of a lion is louder than a woman’s voice.

➝ Pitch :-

• The pitch of sound depends on its frequency. If frequency is more, then the pitch or shrillness is more.
• The pitch of a woman’s voice is more and it is shriller then a man’s voice.

➝ Audible sound :-

• Not all sound produced by vibrating bodies is audible. The human ear can recognise the sounds of frequencies in the range of 20 Hz to 20,000 Hz.
• This range of frequency of sound is called audible sound.

➝ Infrasonic sounds :-

• Sounds of frequencies less than 20 Hz are called infrasonic sounds.

➝ Ultrasonic sounds :-

• The sounds of frequencies greater than 20,000 Hz are called ultrasonic sounds.