In which on of the following locations can a person hear  the echo of a sound?
99508
Look it up. I don't feel like doing your homework.
161459
I remember the Mythbusters addressed this question in episode 8. I remember (vaguely) that it had to do with the frequencies of the sound; the echo sounds almost the same as the original quack and therefore both get confused in our hearing.\nHowever, that's not a scientific study. I've searched at GoogleScholar and although there are papers on the vocalizations of ducks, no one seems to have interest in their echoes. And I imagine that Science would not publish it either :-P
1069113
bats detect the presence of an obstacle by hearing the echo of the sound produced by them. this process is called sound ranging. as ultrasonic waves are used bcoz they have frquency above20000 hz and travel undeviated through long distances and can b confined to a narrow beam since they r not easily absorbed in an medium.light wave is a transverse wave.its a wave in which each particle of medium executes vibrations in the direction perpendicular to the direction of propagation of the wave. and sound wave is alongitudinal wave.its a wave in which each particle of the medium executes vibration about its mean position in direction of propagation of the wave.
221191
i agree.  sound waves are comparable to waves in a fluid, like water.  A good way to test the reflectivity of a material would be to see how strongly water ripples would bounce off of a wall made of that material.  If you picture disturbing water near a submerged marble wall, you could imagine that the waves would bounce off quite neatly compared to how water may reflect waves from a styrofoam wall or a rough, jagged rock surface.  So, bottom line, dense smooth surfaces produce the best echo.
660988
I'm not an echo tech or anything like that but I know that you can't do this online.  There are schools for this. Sonography is a hands on skill and you will have to pay the course fee to learn the equipment, the terminology, the body planes, the techniques and trouble-shooting.  But there's no harm in trying, is there?  It's easy to learn.
888903
Bats or rats; better find out.\n\nPS Clicking is how their radar works, but we are speaking of vocalizations, not radar ( echolocation, to be precise ), and bats do vocalize.
298985
Yeah, the sound in the shell is the echo of the blood flow. The only way I know of to hear the ocean from far away is a recording.
438420
Hi,\n\nHope You and family are fine.\n\nThere can 2 things.\n\n1. Tinnitus : Best described as an acoustic like feeling generated somewhere in the human body. Objective Tinnitus can be heard by the patient and the by the examiner.  It may be caused by spasms-like movement of the small bones in the middle ear, spontaneous movement of the soft palate and sometimes by sounds generated in the cochlea (where the hearing nerves are located.) Subjective tinnitus is best defined as an acoustic-like sensation that is heard only by the patient and not by anyone else. Its cause lies somewhere in the auditory system.\n\nBut it should be persistant, in Your case I its not persistent and only occur while You are walking then it may be SEISMIC EFFECT, That is walking itself produces a jarring motion that may create movement of the small bones or contractions muscles in the middle ear.\n\nIn order to test this hypothesis, consider doing the following: I) Walk slowly (with minimal jarring) and determine if the clicking sensation is present. 2) Then walk at your normal pace and determine if the clicking returns. 3) Move head up and down slowly and notice if the clicking is absent or present. 4). Then, vigorously, move your head up and down and determine if the clicking sound returns.\n\nAnother suggestion is to do the following: If you use hearing aids, take them off and then walk a brief distance and see if the clicking occurs. Put them on and follow the same procedure. If there is no clicking when the hearing aids are not worn, and it is present when they are, it is quite possible that the seismic effect is causing the problem. \n\nAt any rate, what you are describing does not appear to be a harbinger of something that should be of great concern. However, if it is a constant concern, by all means consult an ear specialist.\n\nA word of caution: Regardless of the cause of the perceived sound, even though it is benign, constant, negative attention to that sound can create emotional disturbance. If a medical examination finds no evidence of a physical or medical problem, then be assured the clicking sound offers no threat to the quality of life. \n\nHope that answers Your question.\n\nWarm regards,\n\nTanvir.
1141925
http://www.soundvision.com
947183
Inside your head it will echo.\n\nIf you hold a candle by one ear, you will be able to see it if you look through your other ear.\n\nDragon will tell you if you lost your mind.
62361
Try it. CAUTION - KEEP LIQUIDS AWAY FROM ELECTRICAL CURRENT.\n\nSet up a loudspeaker next to a glass of water (a wine glass is good for this)\n\nWhat do you think will happen when you alter the sound from the speaker?\n\nInvestigate and observe.\nTry a thicker liquid such as milk.
623872
there is a lot of research on sound/acoustics here is a good source of information http://www.livesoundint.com/
1039090
heres the answer.. take some acid.. then you will see the sounds and hear the pictures.. then your ears will have three receptors and your eyes one.
719322
Sound is usually measured in decibels
400150
The range of frequencies that humans can hear is approximately between 20 Hz and 20,000 Hz.
851991
close your eyes. hum a tune and hopefully the location will come to you
78979
None, sound is a wave not a particle. Sound is just a wave of vibrations travelling through atoms.