mediumFPSCNTSCSSPPSCPhysics
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View all1The principle used in radar is the same as that of Sonar. In radar we use radio waves ; whereas in sonar we use ?2The waves which are used for line of sight (LOS) communication are called:3The cracking sound heard when dry hair is combed with a hard rubber comb is due to_________?4A body can escape the gravitational pull of the earth if it is thrown up with a velocity of?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: 56 ft
Explanation: The correct answer is C: 56 ft. A distinct echo is heard only if the reflecting surface is at least 56 feet from the source of sound at ordinary temperatures. This minimum distance ensures the reflected sound reaches the ear at least 1/10th of a second after the original.
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- 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_________?
- A body can escape the gravitational pull of the earth if it is thrown up with a velocity of?
- 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?