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
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Given : Speed of sound `=340 ms^(-1) ,` time = 2s Speed `=("distance travelled")/("time period")` `therefore ` Distance = speed `xx` time `=340xx2 = 680 m` Approximation: The speed of light `(= 3 xx 10^8 m s^(-1))` is much larger in comparison to the speed of sound `(= 340 m s^(-1))`, therefore we can assume that the light takes negligible time and sound takes 2 s to reach the observer
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.
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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) ).
ICSE-PROPAGATION OF SOUND WAVES -EXERCISE -8(B) (Multiple choice type)
