mediumFPSCNTSCSSPPSCPhysics
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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 waves which are used for line of sight (LOS) communication are called:4The cracking sound heard when dry hair is combed with a hard rubber comb is due to_________?5Who was the first scientist to successfully measure the speed of light using observations of Jupiter’s moon Io?6The approximate intensity level of the sound which can cause damage to the ear drum 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.
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- The 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 ________?
- The principle used in radar is the same as that of Sonar. In radar we use radio waves ; whereas in sonar we use ?
- The waves which are used for line of sight (LOS) communication are called:
- The cracking sound heard when dry hair is combed with a hard rubber comb is due to_________?
- Who was the first scientist to successfully measure the speed of light using observations of Jupiter’s moon Io?
- The approximate intensity level of the sound which can cause damage to the ear drum is?