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Which of the following is/are the applications of Sound waves? 1. It is used in the cleaning of instruments, detecting cracks in buildings, machines, ultrasound machines, and echocardiograph, SONAR. 2. In the military it is used to detect enemy aircraft. 3. In astronomy, it’s used to find the speed of moving stars and in sonography. 4. X-rays Select the correct answer using the codes given below.
The depth of a sea can be determined by using SONAR. Consider the following statements about it: 1. It uses ultrasonic waves for the measurement of the depth of a sea. 2. The speed of ultrasonic waves in seawater is the same as that of sound in air. 3. Time taken by ultrasonic waves reflected from the bottom of the sea to reach the detector is used to measure the depth. Which of the above statement(s) is/are correct?
Which of the following can be measured with the help of SONAR?
In SONAR which kind of wave is used?
What are the main instruments in a SONAR, which are used to find the distance, direction and speed of an underwater body?
Ultrasonic waves are used in sonar with greater advantage, because they:
SONAR is mostly used by
An object is 10.64 km below the sea level. A research team sends down a sonar signal to confirm this depth. After how long can it expect to get the echo? Take speed of sound in sea water = 1520 m/s.
Which of the following statement is correct regarding the poem 'Amar Sonar Bangla' written by Rabindranath Tagore?
Which of the following device works on the principle of reflection of sound: a) Stethoscope b) SONAR c) Electric Bell