Advertisements
Advertisements
प्रश्न
उत्तर
LetA1 andA2 be the distances of the two cliffs from the man. then
2 A1 =320 x 4=1280 ............ (i)
and, 2 A2 = 320 x 6 = 1920 .............. (ii)
Adding (i) and (ii)
2 ( A1 +A2) = 3200
or, A1 +A2 = 1600m
`therefore` distance between the two cliffs= 1600 m
APPEARS IN
संबंधित प्रश्न
A radar sends a signal to an aircraft at a distance of 30 km away and receives it back after 2 x 10-4 seconds. What is the speed of the signal?
What should be the minimum distance between source and reflector in water so that echo is heard distinctly?
(The speed of sound in water = 1400 m s-1)
A ship on the surface of water sends a signal and receives it back from a submarine inside water after 4 s. Calculate the distance of the submarine from the ship. (The speed of sound in water is 1450 ms-1)
A person standing at a distance x in front of a cliff fires a gun. Another person B standing behind the person A at a distance y from the cliff hears two sounds of the fired shots after 2s and 3s respectively. Calculate x and y (take speed of sound 320 m/s-1).
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?
A ship which is stationary at a distance of 680 m from the shore, sends a signal to the coast. Its echo is heard in 4s. Find the velocity of sound.
A man standing between two cliffs produces a sound and hears two successive echoes at intervals of 3s and 4s respectively. Calculate the distance between the two cliffs. The speed of sound in the air is 330 ms−1.
A boy stands in from of a cliff on the other side of a river. He fires a gun and hears an echo after 6 seconds. The boy then moves backward by 170 m and again fires the gun. He hears an echo after 7 seconds. Calculate
(i) width of river,
(ii) speed of sound.
