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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 ________?2The principle used in radar is the same as that of Sonar. In radar we use radio waves ; whereas in sonar we use ?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: 7 miles per sec
Explanation: The correct answer is C: 7 miles per sec. A body can escape Earth's gravitational pull if thrown up with a velocity of 7 miles per second (approximately 11.2 km/s). This is called Earth's escape velocity.