Home
Class 9
PHYSICS
The smoke from the gun barrel is seen 2 ...

The smoke from the gun barrel is seen 2 second before the explosion is heard. If the speed of sound in air is 340 m`s^(-1)`, calculate the distance of observer from gun. State the approximation used.

Text Solution

Verified by Experts

Given , speed of sound = 340 `ms^(-1)` , time = 2s
speed = `"distance travelled"/"time taken"`
Distance = speed x time
=340 m x 2= 680 m
Approximation The speed of light `(= 3 xx 10^8 ms^(-1))` is much larger in comparison to the speed of sound (= `340 ms^(-1)`). Therefore, we can assume that the light takes negligible time and sound takes 2s to reach the observer.
Promotional Banner

Topper's Solved these Questions

  • SOUND

    ICSE|Exercise TOPIC 1 Nature of Sound Waves (4 Marks Questions )|6 Videos

  • SOUND

    ICSE|Exercise TOPIC 2 Infrasonic and Ultrasonic Waves (2 Marks Questions )|6 Videos

  • SOUND

    ICSE|Exercise TOPIC 2 Infrasonic and Ultrasonic Waves ( 3 Marks Questions) |3 Videos

  • REFLECTION OF LIGHT

    ICSE|Exercise EXERCISE 7(C)|54 Videos

  • UPTHRUST IN FLUIDS, ARCHIMEDES' PRINCIPLE AND FLOATATION

    ICSE|Exercise EXERCISE 5(c) (Numerical)|9 Videos

Similar Questions

Explore conceptually related problems

A person is standing at the sea shore. An observer on the ship which is anchored in between a vertical cliff and the person on the shore fires a gun. the person on the shore hears two sounds, 2 seconds and 3 seconds after seeing the smoke of the fired gun. If the speed of sound in the air is 320 m s^(-1) -, then calculate : the distance between the observer on the ship and the person on the shore.

A person is standing at the sea shore. An observer on the ship which is anchored in between a vertical cliff and the person on the shore fires a gun. the person on the shore hears two sounds, 2 seconds and 3 seconds after seeing the smoke of the fired gun. If the speed of sound in the air is 320 m s^(-1) -, then calculate : the distance between the cliff and the observer on the ship.

The time interval between a lightning flash and the first sound of thunder is 5 s. If the speed of sound in air is 330 m s^(-1) , find the distance of flash from the observer.

The time interval between a lightning flash and the first sound of thunder was found to be 5 s. If the speed of sound in air is 330 m s^(-1) , find the distance of flash from the observe.

A boy hears an echo of his own voice from a distant hill after one second. The speed of sound in air is 350 m s^(-1) . What is the distance of the hill from the boy?

A boy fires a gun and another boy at a distance hears the sound of fire 2.5 s after seeing the flash. If speed of sound in air is 340 m s^(-1) , find the distance between the boys.

During a thunderstorm, the thunder is heard 2.5 seconds after the flash of lightning is seen. If the speed of sound is 330 m s^(-1) find the distance at which lightning took place.

A pendulum has a frequency of 5 vibrations per second. An observer starts the pendulum and fires a gun simultaneously. He hears echo from the cliff after 8 vibrations of the pendulum. If the velocity of sound in air is 340 m s^(-1) , find the distance between the cliff and the observer.

A boy on a hill A fires a gun. Another boy on hill B hears the sound after 4 s. If the speed of sound is 330 m s^(-1) , find the distance between the two hills.

A man standing 48 m away from a wall fires a gun. Calculate the time after which an echo is heard. (The speed of sound in air is 320 m s^(-1) ).