Advertisements
Advertisements
प्रश्न
The smoke from the gun barrel is seen 2 seconds before the explosion is heard. If the speed of sound in air is 340 ms−1, calculate the distance of the observer from the gun. State the approximation used.
उत्तर
The light has a much larger speed (= 3 × 108 ms−1) in comparison to the sound (= 340 ms−1), therefore we can assume that the light takes negligible time and the sound takes 2 seconds to reach the observer.
Now Speed = `"Distance travelled"/"Time taken"`
∴ Distance = Speed × Time
= 340 × 2
= 680 m.
APPEARS IN
संबंधित प्रश्न
A man standing 25 m away from a wall produces a sound and receives the reflected sound.
- Calculate the time after which he receives the reflected sound if the speed of the sound in air is 350 m/s-1.
- Will the man be able to hear a distinct echo? Explain the answer.
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 ms-1).
A person standing between the two vertical cliffs produces a sound. Two successive echoes are heard at 4 s and 6 s. Calculate the distance between the cliffs.
(Speed of sound in air = 320 ms-1)
A man fires a gun and hears its echo after 5 s. The man then moves 310 m towards the hill and fires his gun again. This time he hears the echo after 3 s. calculate the speed of sound.
Figure below shows the distance-displacement graph of two waves A and B. Compare
- the amplitude,
- the wavelength of the two waves.
What is the range of audibility?
The wavelength and frequency of the sound wave in a certain medium is 40 cm and 835 Hz respectively. In the same medium if another wave has a wavelength equal to 32 cm, calculate its frequency.
An observer stands at a certain distance away from a cliff and produces a loud sound. He hears the echo of the sound after 1.8 s. Calculate the distance between the cliff and the observer if the velocity of sound in air is 340 m−1.
A person standing between two vertical cliffs and is 640 m away from the nearest cliff. He shouted and heard the first echo after 45s and the second echo after further 3s. Calculate the speed of sound in air and the distance between the cliffs.
