Question

the speed of sound in air is 320 M per second and in water is 1600 M per second . it takes 2.5 second for sound to reach a certain from the source placed in a air. I)find the distance.ii)how much time it will take for sound to reach the same distance when the sources is in water?.

Answer 1

Answer:1) Distance traveled by the sound in air is 800 m.

2) Time taken by the sound to travel 800 m is water is 0.5 s

Explanation:

Speed of sound is air = 320 m/s

Time taken by the sound wave in air = 2.5 seconds

$Speed=\frac{Distance}{time}$

1) Distance traveled by the sound in air:

$Distance=320 m/s\times 2.5 s=800 m$

2) Speed of sound in water = 1600 m/s

Distance traveled by the sound is water =- 800 m (given)

$Time=\frac{Distance}{Speed}=\frac{800 m}{1600 m/s}=0.5 s$

Time taken by the sound to travel 800 m is water is 0.5 s

Answer 2

Answer:

i) to find distance

speed =distance/time

therefore

given speed = 320 ms-1

given time = 2.5 seconds

D/2.5= 320

D= 320/2.5= 800 meters

ii) D= 800m

speed of sound in water = 1600 ms-1

speed =Distance/time

therefore 1600 = 800/time

=>800/time = 1600

time = 1600/800 = 2 seconds

Explanation:

i) we have to find the distance as we know speed equals to distance by time so in the next step put in all the values and then take dis out of the equation and calculate

ii) we have to find the time for the sound to travel the same distance when the source is in water as we know speed equals to distance by time we put in the values in the next step and then we take out time and divide 1600/800