The figure given below shows the sound navigation system. It takes 2 s to record the echo of SONAR. If the speed of sound in water is 1450 m/s. Find out

the depth of the floor

wavelength of ultrasonic waves if the frequency is 20 kHz.

Asked by Topperlearning User 20th September 2016, 10:36 AM

Answered by Expert

Answer:

Given that it takes 2 s to record the echo of SONAR.
So, the time taken by the ultrasound to travel from the ship to the sea bed will be half this time, which is $begin mathsize 12px style fraction numerator 2 straight s over denominator 2 end fraction equals 1 space straight s end style$
$begin mathsize 12px style Now comma space Speed equals Distance over Time rightwards arrow Distance equals Speed space cross times space Time space space space space space space space space space space space space space space space space space equals 1450 space straight m divided by straight s space cross times space 1 space straight S rightwards arrow Distance equals 1450 space straight m divided by straight s end style$
Given that frequency = 20 kHz
Speed = Frequency × Wavelength
1450 = 20 × λ
→ λ = 72.5 m

Answered by Expert 20th September 2016, 12:36 PM

Rate this answer

You have rated this answer /10

Your answer has been posted successfully!

15th May 2016, 8:09 PM

20th May 2016, 11:47 AM

A train starting from rest moves with a uniform acceleration of 0.2 m/s 2 for five minutes.Calculate the speed acquired and the distance travelled in this time.

From a station ‘X’ a train starts from rest and attains a speed of 54 km/h in 10 s, then with this uniform speed it moves for 8 minutes and then by applying brakes it stops at station ‘Y’ in 6 s.Find the distance between station ‘X’ and ‘Y’.

Draw a position-time graph and a speed-time graph for a ball thrown vertically upwardswhich comes to rest on reaching the ground.

If a ball hits the ground with velocity ‘v’, it bounces back up with velocity ‘v’. If sucha ball is dropped from a height ‘h’ above the ground, how high will it bounce ? Justify your answer.

A body moving with a velocity of 2 m/s acquires a velocity of 10m/s in 5s. Find its acceleration.

When can we say the motion of an object as uniform motion ? What can be the shape of thepath covered by a moving object to have uniform speed and uniform velocity ?

26th May 2016, 9:56 AM

3rd June 2016, 11:15 AM

6th June 2016, 11:59 AM

RELATED STUDY RESOURCES :

CBSE Class-9 QUESTION ANSWERS