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: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: B: Small electric sparks
Explanation: The correct answer is B: Small electric sparks. The cracking sound when dry hair is combed with a rubber comb is due to small electric sparks. The rubbing creates static electricity, and the sparks occur as the charge is discharged.
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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:
- 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?