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View all1The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ________?2A body can escape the gravitational pull of the earth if it is thrown up with a velocity of?3The cracking sound heard when dry hair is combed with a hard rubber comb is due to_________?4The approximate intensity level of the sound which can cause damage to the ear drum is?5The waves which are used for line of sight (LOS) communication are called:6The Largest Producer of Electricity in the Islamic World is______________________?
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Correct Answer: C: Ultrasonic
Explanation: The correct answer is C: Ultrasonic. In sonar, ultrasonic sound waves are used instead of radio waves. Sonar sends out ultrasonic pulses and detects echoes reflected from underwater objects to determine their distance and location.