Advertisements
Advertisements
Question
A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.
Advertisements
Solution
Time taken to hear the echo, t = 5 s
Distance of the object from the submarine, d = 3625 m
Total distance travelled by the sonar waves during the transmission and reception in water = 2d
Velocity of sound in water, `"v"=(2d)/t=(2xx3625)/5=1450" ms"^-1`
RELATED QUESTIONS
Define the 'frequency' and 'time-period' of a wave. What is the relation between the two?
Fill in the blank with suitable word .
Sound waves are caused by ...................
Name the three characteristics of sound.
How is an ultrasound scan for fetus (unborn baby) better than X-ray ?
What name is given to sound waves of frequencies higher than 20 kHz ?
Draw labelled diagrams to represent (a) soft sound, and (b) loud sound, of the same frequency.
What is the range of frequencies associated with (a) infrasound (b) audible sound, and (c) ultrasound ?
Name an animal which navigates and finds food by ecolocation.
Which of the two produces ultrasonic waves : porpoise or whale ?
Expand the abbreviation of the term SONAR.
