A rock under water is 1595 m deep. Find the time in which an ultrasonic signal returns after reflection from the rock. Speed of ultrasonic waves in water = `1450m//s`.

A rock under water is 2900 m deep. Calculate the time in which an ultrasonic signal will return after reflection from the rock. Take velocity of ultrasonic waves in water = 1.45 km//s.

(a) What is sonar? Explain its use. (b) A sonar station picks up a return signal after 3 seconds. How far away is the object? (Speed of sound in water = 1440 m//s) .

There is a sunken ship at a depth of 50 m in a sea. From the surface of sea, waves are sent to locate it. Find the time when the wave after reflection will reach the surface. State whether echo is heard or not? Give reason. Take speed of sound in water = 1400 m s^(-1)

A ship produces ultrasonic sound which is collected in 3.42 s after reflection from the surface of sea. If the velocity of ultrasonics is 1531ms^-1 , then what is the distance of sea surface from sea ?

A ship produces ultrasonic sound which is collected in 8 s after reflection from the surface of sea. If the velocity of ultrasonics is 1531ms^-1 , then what is the distance of sea surface from sea ?

Write the following statements in a sequential order to find the depth of the ocean bed by the using sonar . (A) The depth of the ocean bed can be found by d = (vt)/(2) . (B) At the bottom of a ship two devices , one is transmitter which products ultrasonics and a receiver for the detection of the reflected ultrasonics from the ocean bed are fixed . (C) The velocity fo ultrasonics in ocean water is 'v' and the time taken to receive the reflected ultrasonics from the ocean bed be 'f'. (D) If the depth of ocean bed is 'd' , then v = (d + d)/(t) = (2d)/(t) .

In a submarine fitted with a SONAR the time delay between generation of a signal and reception of its echo from an enemy ship is 110.3 seconds. If speed of sound in water is 1450ms^(-1) then caculate the distance of the enemy ship from the submarine.

A bat,flying at velocity V_B = 12.5 m//s ,isfollowed by a car running at velocity V_C = 50 m//s . Actual directions of the velocities of the car and the bat are as shown in the figure below, both being in the same horizontal plane (the plane of the figure). To detect the car, the bat radiates ultrasonic waves of frequency 36 kHz. Speed of sound at surrounding temperature is 350 m//s . There is an ultrasonic frequency detector fitted in the car. Calculate the frequency recorded by this detector. The ultrasonic waves radiated by the bat are reflected by the car. The bat detects these waves and from the detected frequency, it knows about the speed of the car. Calculate the frequency of the reflected waves as detected by the bat. (sin 37° = cos 53° ≈ 0.6, sin 53° = cos 37° ≈ 0.8)